From 626f6047a2eca2d038882e0778368a61ff5d3e19 Mon Sep 17 00:00:00 2001
From: Wolfgang Walther <walther@technowledgy.de>
Date: Tue, 17 Sep 2024 21:55:33 +0200
Subject: [PATCH] postgresqlPackages: replace custom installPhase with
 buildPostgresqlExtension helper

---
 .../sql/postgresql/buildPostgresExtension.nix | 129 ++++++++++++++++++
 pkgs/servers/sql/postgresql/ext/age.nix       |  12 +-
 .../servers/sql/postgresql/ext/anonymizer.nix |  15 +-
 .../postgresql/ext/apache_datasketches.nix    |  31 +----
 pkgs/servers/sql/postgresql/ext/citus.nix     |  18 +--
 .../servers/sql/postgresql/ext/cstore_fdw.nix |  13 +-
 pkgs/servers/sql/postgresql/ext/h3-pg.nix     |  11 +-
 pkgs/servers/sql/postgresql/ext/hypopg.nix    |  12 +-
 .../sql/postgresql/ext/jsonb_deep_sum.nix     |  14 +-
 pkgs/servers/sql/postgresql/ext/lantern.nix   |  17 +--
 pkgs/servers/sql/postgresql/ext/periods.nix   |  12 +-
 .../sql/postgresql/ext/pg_auto_failover.nix   |  13 +-
 pkgs/servers/sql/postgresql/ext/pg_bigm.nix   |  12 +-
 pkgs/servers/sql/postgresql/ext/pg_cron.nix   |  14 +-
 .../servers/sql/postgresql/ext/pg_ed25519.nix |  15 +-
 .../sql/postgresql/ext/pg_embedding.nix       |  12 +-
 .../sql/postgresql/ext/pg_hint_plan.nix       |  12 +-
 pkgs/servers/sql/postgresql/ext/pg_hll.nix    |  12 +-
 pkgs/servers/sql/postgresql/ext/pg_ivm.nix    |  12 +-
 .../sql/postgresql/ext/pg_libversion.nix      |  14 +-
 pkgs/servers/sql/postgresql/ext/pg_net.nix    |  14 +-
 .../servers/sql/postgresql/ext/pg_partman.nix |  15 +-
 .../sql/postgresql/ext/pg_rational.nix        |  17 +--
 .../sql/postgresql/ext/pg_relusage.nix        |  12 +-
 pkgs/servers/sql/postgresql/ext/pg_repack.nix |  11 +-
 .../sql/postgresql/ext/pg_roaringbitmap.nix   |  14 +-
 .../sql/postgresql/ext/pg_safeupdate.nix      |  10 +-
 .../sql/postgresql/ext/pg_similarity.nix      |  13 +-
 .../servers/sql/postgresql/ext/pg_squeeze.nix |  18 +--
 pkgs/servers/sql/postgresql/ext/pg_topn.nix   |  14 +-
 pkgs/servers/sql/postgresql/ext/pg_uuidv7.nix |  10 +-
 pkgs/servers/sql/postgresql/ext/pgaudit.nix   |  12 +-
 pkgs/servers/sql/postgresql/ext/pgjwt.nix     |  10 +-
 pkgs/servers/sql/postgresql/ext/pgmq.nix      |  14 +-
 pkgs/servers/sql/postgresql/ext/pgroonga.nix  |  16 +--
 pkgs/servers/sql/postgresql/ext/pgrouting.nix |  12 +-
 pkgs/servers/sql/postgresql/ext/pgsodium.nix  |  14 +-
 .../servers/sql/postgresql/ext/pgsql-http.nix |  12 +-
 pkgs/servers/sql/postgresql/ext/pgtap.nix     |   7 +-
 pkgs/servers/sql/postgresql/ext/pgvector.nix  |  12 +-
 .../sql/postgresql/ext/plpgsql_check.nix      |  12 +-
 pkgs/servers/sql/postgresql/ext/plr.nix       |  11 +-
 .../sql/postgresql/ext/plv8/default.nix       |  17 +--
 pkgs/servers/sql/postgresql/ext/postgis.nix   |  29 ++--
 pkgs/servers/sql/postgresql/ext/repmgr.nix    |  14 +-
 pkgs/servers/sql/postgresql/ext/rum.nix       |  11 +-
 pkgs/servers/sql/postgresql/ext/smlar.nix     |  12 +-
 .../sql/postgresql/ext/system_stats.nix       |  17 +--
 pkgs/servers/sql/postgresql/ext/tds_fdw.nix   |  13 +-
 .../sql/postgresql/ext/temporal_tables.nix    |  12 +-
 .../sql/postgresql/ext/timescaledb.nix        |   6 +-
 .../sql/postgresql/ext/tsearch_extras.nix     |  11 +-
 pkgs/servers/sql/postgresql/ext/tsja.nix      |   1 -
 pkgs/servers/sql/postgresql/ext/wal2json.nix  |  10 +-
 pkgs/servers/sql/postgresql/generic.nix       |   1 +
 55 files changed, 263 insertions(+), 571 deletions(-)
 create mode 100644 pkgs/servers/sql/postgresql/buildPostgresExtension.nix

diff --git a/pkgs/servers/sql/postgresql/buildPostgresExtension.nix b/pkgs/servers/sql/postgresql/buildPostgresExtension.nix
new file mode 100644
index 00000000000000..af4a06c589c9c3
--- /dev/null
+++ b/pkgs/servers/sql/postgresql/buildPostgresExtension.nix
@@ -0,0 +1,129 @@
+# PostgreSQL's build system for extensions (PGXS) makes the following assumptions:
+# - All extensions will be installed in the same prefix as PostgreSQL itself.
+# - pg_config is able to return the correct paths for bindir/libdir/datadir etc.
+#
+# Both of those assumptions break with nix. Since each extension is a separate
+# derivation, we need to put all its files into a different folder. At the same
+# time, pg_config only points to the PostgreSQL derivation's paths.
+#
+# When building extensions, the paths provided by pg_config are used for two
+# purposes:
+# - To find postgres libs and headers and reference those paths via -L and -I flags.
+# - To determine the correct install directory.
+#
+# The PGXS Makefiles also support an environment variable DESTDIR, which is added as
+# a prefix to all install locations. This is primarily used for temporary installs
+# while running the test suite. Since pg_config returns absolute paths to /nix/store
+# for us, using DESTDIR will result in install locations of the form:
+#   $DESTIDR/nix/store/<postgresql-output>/...
+#
+# In multiple iterations, the following approaches have been tried to work around all
+# of this:
+# 1. For a long time, all extensions in nixpkgs just overwrote the installPhase
+#    and moved the respective files to the correct location manually. This approach
+#    is not maintainable, because whenever upstream adds a new file, we'd have to
+#    make sure the file is correctly installed as well. Additionally, it makes adding
+#    a new extension harder than it should be.
+#
+# 2. A wrapper around pg_config could just replace the returned paths with paths to
+#    $out of currently building derivation, i.e. the extension. This works for install-
+#    ation, but breaks for any of the libs and headers the extension needs from postgres
+#    itself.
+#
+# 3. A variation of 2., but make the pg_config wrapper only return the changed paths
+#    during the installPahse. During configure and build, it would return the regular
+#    paths to the PostgreSQL derivation. This works better, but not for every case.
+#    Some extensions try to be smarter and search for the "postgres" binary to deduce
+#    the necessary paths from that. Those would still need special handling.
+#
+# 4. Use the fact that DESTDIR is prepended to every installation directory - and only
+#    there, to run a replacement of all Makefiles in postgres' lib/pgxs/ folder and
+#    all Makefiles in the extension's source. "$DESTDIR/$bindir" can be replaced with
+#    "$out/bin" etc. - thus mapping the installPhase directly into the right output.
+#    This works beautifully - for the majority of cases. But it doesn't work for
+#    some extensions that use CMake. And it doesn't work for some extensions that use
+#    custom variables instead of the default "bindir" and friends.
+#
+# 5. Just set DESTDIR to the extensions's output and then clean up afterward. This will
+#    result in paths like this:
+#      /nix/store/<extension-output>/nix/store/<postgresql-output>/...
+#    Directly after the installPhase, we'll move the files in the right folder.
+#    This seems to work consistently across all extensions we have in nixpkgs right now.
+#    Of course, it would break down for any extension that doesn't support DESTDIR -
+#    but that just means PGXS is not used either, so that's OK.
+#
+# This last approach is the one we're taking in this file. To make sure the removal of the
+# nested nix/store happens immediately after the installPhase, before any other postInstall
+# hooks run, this needs to be run in an override of `mkDerivation` and not in a setup hook.
+
+{
+  lib,
+  stdenv,
+  postgresql,
+}:
+
+args:
+
+let
+  buildPostgresExtension = finalAttrs: prevAttrs: {
+    buildInputs = [ postgresql ] ++ prevAttrs.buildInputs or [ ];
+
+    installFlags = [
+      "DESTDIR=${placeholder "out"}"
+    ] ++ prevAttrs.installFlags or [ ];
+
+    postInstall =
+      ''
+        # DESTDIR + pg_config install the files into
+        # /nix/store/<extension>/nix/store/<postgresql>/...
+        # We'll now remove the /nix/store/<postgresql> part:
+        if [[ -d "$out${postgresql}" ]]; then
+            cp -alt "$out" "$out${postgresql}"/*
+            rm -r "$out${postgresql}"
+        fi
+
+        if [[ -d "$out${postgresql.dev}" ]]; then
+            mkdir -p "''${dev:-$out}"
+            cp -alt "''${dev:-$out}" "$out${postgresql.dev}"/*
+            rm -r "$out${postgresql.dev}"
+        fi
+
+        if [[ -d "$out${postgresql.lib}" ]]; then
+            mkdir -p "''${lib:-$out}"
+            cp -alt "''${lib:-$out}" "$out${postgresql.lib}"/*
+            rm -r "$out${postgresql.lib}"
+        fi
+
+        if [[ -d "$out${postgresql.doc}" ]]; then
+            mkdir -p "''${doc:-$out}"
+            cp -alt "''${doc:-$out}" "$out${postgresql.doc}"/*
+            rm -r "$out${postgresql.doc}"
+        fi
+
+        if [[ -d "$out${postgresql.man}" ]]; then
+            mkdir -p "''${man:-$out}"
+            cp -alt "''${man:-$out}" "$out${postgresql.man}"/*
+            rm -r "$out${postgresql.man}"
+        fi
+
+        # In some cases (postgis) parts of the install script
+        # actually work "OK", before we add DESTDIR, so some
+        # files end up in
+        # /nix/store/<extension>/nix/store/<extension>/...
+        if [[ -d "$out$out" ]]; then
+            cp -alt "$out" "$out$out"/*
+            rm -r "$out$out"
+        fi
+
+        if [[ -d "$out/nix/store" ]]; then
+            if ! rmdir "$out/nix/store" "$out/nix"; then
+              find "$out/nix"
+              nixErrorLog 'Found left-overs in $out/nix/store, make sure to move them into $out properly.'
+              exit 1
+            fi
+        fi
+      ''
+      + prevAttrs.postInstall or "";
+  };
+in
+stdenv.mkDerivation (lib.extends buildPostgresExtension (lib.toFunction args))
diff --git a/pkgs/servers/sql/postgresql/ext/age.nix b/pkgs/servers/sql/postgresql/ext/age.nix
index b80d1c203b2c63..a224762293ec47 100644
--- a/pkgs/servers/sql/postgresql/ext/age.nix
+++ b/pkgs/servers/sql/postgresql/ext/age.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, bison, fetchFromGitHub, flex, perl, postgresql }:
+{ lib, stdenv, bison, fetchFromGitHub, flex, perl, postgresql, buildPostgresExtension }:
 
 let
   hashes = {
@@ -9,7 +9,7 @@ let
     "12" = "sha256-JFNk17ESsIt20dwXrfBkQ5E6DbZzN/Q9eS6+WjCXGd4=";
   };
 in
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "age";
   version = "1.5.0-rc0";
 
@@ -20,20 +20,12 @@ stdenv.mkDerivation rec {
     hash = hashes.${lib.versions.major postgresql.version} or (throw "Source for Age is not available for ${postgresql.version}");
   };
 
-  buildInputs = [ postgresql ];
-
   makeFlags = [
     "BISON=${bison}/bin/bison"
     "FLEX=${flex}/bin/flex"
     "PERL=${perl}/bin/perl"
   ];
 
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   passthru.tests = stdenv.mkDerivation {
     inherit version src;
 
diff --git a/pkgs/servers/sql/postgresql/ext/anonymizer.nix b/pkgs/servers/sql/postgresql/ext/anonymizer.nix
index 4bb5aa544440eb..7e800761e92bad 100644
--- a/pkgs/servers/sql/postgresql/ext/anonymizer.nix
+++ b/pkgs/servers/sql/postgresql/ext/anonymizer.nix
@@ -1,23 +1,16 @@
-{ lib, stdenv, pg-dump-anon, postgresql, runtimeShell, jitSupport, llvm }:
+{ lib, stdenv, pg-dump-anon, postgresql, runtimeShell, jitSupport, llvm, buildPostgresExtension }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "postgresql_anonymizer";
 
   inherit (pg-dump-anon) version src passthru;
 
-  buildInputs = [ postgresql ];
   nativeBuildInputs = [ postgresql ] ++ lib.optional jitSupport llvm;
 
   strictDeps = true;
 
-  makeFlags = [
-    "BINDIR=${placeholder "out"}/bin"
-    "datadir=${placeholder "out"}/share/postgresql"
-    "pkglibdir=${placeholder "out"}/lib"
-    "DESTDIR="
-  ];
-
-  postInstall = ''
+  # Needs to be after postInstall, where removeNestedNixStore runs
+  preFixup = ''
     cat >$out/bin/pg_dump_anon.sh <<'EOF'
     #!${runtimeShell}
     echo "This script is deprecated by upstream. To use the new script,"
diff --git a/pkgs/servers/sql/postgresql/ext/apache_datasketches.nix b/pkgs/servers/sql/postgresql/ext/apache_datasketches.nix
index af3df00fca6446..fea5610b2a1b7d 100644
--- a/pkgs/servers/sql/postgresql/ext/apache_datasketches.nix
+++ b/pkgs/servers/sql/postgresql/ext/apache_datasketches.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchFromGitHub, postgresql, boost182, nixosTests }:
+{ stdenv, lib, fetchFromGitHub, postgresql, boost182, nixosTests, buildPostgresExtension }:
 
 let
   version = "1.7.0";
@@ -20,7 +20,7 @@ let
   };
 in
 
-stdenv.mkDerivation {
+buildPostgresExtension {
   pname = "apache_datasketches";
   inherit version;
 
@@ -28,7 +28,7 @@ stdenv.mkDerivation {
 
   sourceRoot = main_src.name;
 
-  buildInputs = [ postgresql boost182 ];
+  buildInputs = [ boost182 ];
 
   patchPhase = ''
     runHook prePatch
@@ -36,31 +36,6 @@ stdenv.mkDerivation {
     runHook postPatch
   '';
 
-  installPhase = ''
-    runHook preInstall
-    install -D -m 644 ./datasketches${postgresql.dlSuffix} -t $out/lib/
-    cat \
-      sql/datasketches_cpc_sketch.sql \
-      sql/datasketches_kll_float_sketch.sql \
-      sql/datasketches_kll_double_sketch.sql \
-      sql/datasketches_theta_sketch.sql \
-      sql/datasketches_frequent_strings_sketch.sql \
-      sql/datasketches_hll_sketch.sql \
-      sql/datasketches_aod_sketch.sql \
-      sql/datasketches_req_float_sketch.sql \
-      sql/datasketches_quantiles_double_sketch.sql \
-      > sql/datasketches--${version}.sql
-    install -D -m 644 ./datasketches.control -t $out/share/postgresql/extension
-    install -D -m 644 \
-      ./sql/datasketches--${version}.sql \
-      ./sql/datasketches--1.3.0--1.4.0.sql \
-      ./sql/datasketches--1.4.0--1.5.0.sql \
-      ./sql/datasketches--1.5.0--1.6.0.sql \
-      ./sql/datasketches--1.6.0--1.7.0.sql \
-      -t $out/share/postgresql/extension
-    runHook postInstall
-  '';
-
   passthru.tests.apache_datasketches = nixosTests.apache_datasketches;
 
   meta = {
diff --git a/pkgs/servers/sql/postgresql/ext/citus.nix b/pkgs/servers/sql/postgresql/ext/citus.nix
index 28d6139f0a50da..4f972ff103218d 100644
--- a/pkgs/servers/sql/postgresql/ext/citus.nix
+++ b/pkgs/servers/sql/postgresql/ext/citus.nix
@@ -4,9 +4,10 @@
 , fetchFromGitHub
 , lz4
 , postgresql
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "citus";
   version = "12.1.2";
 
@@ -20,23 +21,8 @@ stdenv.mkDerivation rec {
   buildInputs = [
     curl
     lz4
-    postgresql
   ];
 
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/lib src/backend/columnar/citus_columnar${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension src/backend/columnar/build/sql/*.sql
-    install -D -t $out/share/postgresql/extension src/backend/columnar/*.control
-
-    install -D -t $out/lib src/backend/distributed/citus${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension src/backend/distributed/build/sql/*.sql
-    install -D -t $out/share/postgresql/extension src/backend/distributed/*.control
-
-    runHook postInstall
-  '';
-
   meta = with lib; {
     # "Our soft policy for Postgres version compatibility is to support Citus'
     # latest release with Postgres' 3 latest releases."
diff --git a/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix b/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
index c9f01190c91268..4152bb77ae588a 100644
--- a/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
+++ b/pkgs/servers/sql/postgresql/ext/cstore_fdw.nix
@@ -1,11 +1,10 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, protobufc }:
+{ lib, stdenv, fetchFromGitHub, postgresql, protobufc, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "cstore_fdw";
   version = "unstable-2022-03-08";
 
   nativeBuildInputs = [ protobufc ];
-  buildInputs = [ postgresql ];
 
   src = fetchFromGitHub {
     owner  = "citusdata";
@@ -14,14 +13,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-02wcCqs8A5ZOZX080fgcNJTQrYQctnlwnA8+YPaRTZc=";
   };
 
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *.so      $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     broken      = versionAtLeast postgresql.version "14";
     description = "Columnar storage for PostgreSQL";
diff --git a/pkgs/servers/sql/postgresql/ext/h3-pg.nix b/pkgs/servers/sql/postgresql/ext/h3-pg.nix
index 1a0c701c770261..4769df30543e85 100644
--- a/pkgs/servers/sql/postgresql/ext/h3-pg.nix
+++ b/pkgs/servers/sql/postgresql/ext/h3-pg.nix
@@ -5,9 +5,10 @@
 , h3_4
 , postgresql
 , postgresqlTestExtension
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "h3-pg";
   version = "4.1.3";
 
@@ -32,16 +33,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   buildInputs = [
     h3_4
-    postgresql
   ];
 
-  installPhase = ''
-    install -D -t $out/lib h3/h3.so
-    install -D -t $out/share/postgresql/extension h3/h3-*.sql h3/h3.control
-    install -D -t $out/lib h3_postgis/h3_postgis.so
-    install -D -t $out/share/postgresql/extension h3_postgis/h3_postgis-*.sql h3_postgis/h3_postgis.control
-  '';
-
   passthru.tests.extension = postgresqlTestExtension {
     inherit (finalAttrs) finalPackage;
     withPackages = [ "postgis" ];
diff --git a/pkgs/servers/sql/postgresql/ext/hypopg.nix b/pkgs/servers/sql/postgresql/ext/hypopg.nix
index 534a21bb6d69f6..4401678d93f538 100644
--- a/pkgs/servers/sql/postgresql/ext/hypopg.nix
+++ b/pkgs/servers/sql/postgresql/ext/hypopg.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, gitUpdater }:
+{ lib, stdenv, fetchFromGitHub, postgresql, gitUpdater, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "hypopg";
   version = "1.4.1";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-88uKPSnITRZ2VkelI56jZ9GWazG/Rn39QlyHKJKSKMM=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.control
-    install -D -t $out/share/postgresql/extension *.sql
-  '';
-
   passthru = {
     updateScript = gitUpdater {
       ignoredVersions = "beta";
diff --git a/pkgs/servers/sql/postgresql/ext/jsonb_deep_sum.nix b/pkgs/servers/sql/postgresql/ext/jsonb_deep_sum.nix
index 092212aa3de00a..cf20427c8db9de 100644
--- a/pkgs/servers/sql/postgresql/ext/jsonb_deep_sum.nix
+++ b/pkgs/servers/sql/postgresql/ext/jsonb_deep_sum.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "jsonb_deep_sum";
   version = "unstable-2021-12-24";
 
@@ -11,16 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-W1wNILAwTAjFPezq+grdRMA59KEnMZDz69n9xQUqdc0=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "PostgreSQL extension to easily add jsonb numeric";
     homepage = "https://github.com/furstenheim/jsonb_deep_sum";
diff --git a/pkgs/servers/sql/postgresql/ext/lantern.nix b/pkgs/servers/sql/postgresql/ext/lantern.nix
index 80263fc2b4a91c..5e28566466413c 100644
--- a/pkgs/servers/sql/postgresql/ext/lantern.nix
+++ b/pkgs/servers/sql/postgresql/ext/lantern.nix
@@ -4,9 +4,10 @@
 , fetchFromGitHub
 , postgresql
 , postgresqlTestExtension
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "postgresql-lantern";
   version = "0.2.4";
 
@@ -22,20 +23,6 @@ stdenv.mkDerivation (finalAttrs: {
     cmake
   ];
 
-  buildInputs = [
-    postgresql
-  ];
-
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/lib lantern${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension lantern-*.sql
-    install -D -t $out/share/postgresql/extension lantern.control
-
-    runHook postInstall
-  '';
-
   cmakeFlags = [
     "-DBUILD_FOR_DISTRIBUTING=ON"
   ];
diff --git a/pkgs/servers/sql/postgresql/ext/periods.nix b/pkgs/servers/sql/postgresql/ext/periods.nix
index 422d6ddaf2b346..e90311761a1ba0 100644
--- a/pkgs/servers/sql/postgresql/ext/periods.nix
+++ b/pkgs/servers/sql/postgresql/ext/periods.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "periods";
   version = "1.2.2";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-ezt+MtDqPM8OmJCD6oQTS644l+XHZoxuivq0PUIXOY8=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "PostgreSQL extension implementing SQL standard functionality for PERIODs and SYSTEM VERSIONING";
     homepage = "https://github.com/xocolatl/periods";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_auto_failover.nix b/pkgs/servers/sql/postgresql/ext/pg_auto_failover.nix
index 42d055a029aeb3..93b2164bc62040 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_auto_failover.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_auto_failover.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_auto_failover";
   version = "2.1";
 
@@ -11,14 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-OIWykfFbVskrkPG/zSmZtZjc+W956KSfIzK7f5QOqpI=";
   };
 
-  buildInputs = postgresql.buildInputs ++ [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/bin src/bin/pg_autoctl/pg_autoctl
-    install -D -t $out/lib src/monitor/pgautofailover.so
-    install -D -t $out/share/postgresql/extension src/monitor/*.sql
-    install -D -t $out/share/postgresql/extension src/monitor/pgautofailover.control
-  '';
+  buildInputs = postgresql.buildInputs;
 
   meta = with lib; {
     description = "PostgreSQL extension and service for automated failover and high-availability";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_bigm.nix b/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
index f47ce5694588e5..fb4560109b95ed 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_bigm.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, fetchpatch, postgresql }:
+{ lib, stdenv, fetchFromGitHub, fetchpatch, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_bigm";
   version = "1.2-20200228";
 
@@ -19,16 +19,8 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  buildInputs = [ postgresql ];
-
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D -t $out/lib pg_bigm${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "Text similarity measurement and index searching based on bigrams";
     homepage = "https://pgbigm.osdn.jp/";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_cron.nix b/pkgs/servers/sql/postgresql/ext/pg_cron.nix
index 02c6e6435ae756..d3b135c01c1212 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_cron.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_cron.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_cron";
   version = "1.6.2";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "citusdata";
     repo   = pname;
@@ -13,14 +11,6 @@ stdenv.mkDerivation rec {
     hash   = "sha256-/dD1gX0+RRsBFIjSV9TVk+ppPw0Jrzssl+rRZ2qAp4w=";
   };
 
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Run Cron jobs through PostgreSQL";
     homepage    = "https://github.com/citusdata/pg_cron";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_ed25519.nix b/pkgs/servers/sql/postgresql/ext/pg_ed25519.nix
index 010f8f819da947..44f9a4fadeea57 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_ed25519.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_ed25519.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitLab, postgresql }:
+{ lib, stdenv, fetchFromGitLab, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_ed25519";
   version = "0.2";
   src = fetchFromGitLab {
@@ -10,17 +10,6 @@ stdenv.mkDerivation rec {
     sha256 = "16w3qx3wj81bzfhydl2pjhn8b1jak6h7ja9wq1kc626g0siggqi0";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    mkdir -p $out/bin    # For buildEnv to setup proper symlinks. See #22653
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *.so      $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "PostgreSQL extension for signing and verifying ed25519 signatures";
     homepage = "https://gitlab.com/dwagin/pg_ed25519";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_embedding.nix b/pkgs/servers/sql/postgresql/ext/pg_embedding.nix
index 5306a619038d5b..ea49a59e91ceb1 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_embedding.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_embedding.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_embedding";
   version = "0.3.6";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-NTBxsQB8mR7e/CWwkCEyDiYhi3Nxl/aKgRBwqc0THcI=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib *.so
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "PostgreSQL extension implementing the HNSW algorithm for vector similarity search";
     homepage = "https://github.com/neondatabase/pg_embedding";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
index afc5b9fe650653..ad235ca245802f 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
 let
   source = {
@@ -24,7 +24,7 @@ let
     };
   }.${lib.versions.major postgresql.version} or (throw "Source for pg_hint_plan is not available for ${postgresql.version}");
 in
-stdenv.mkDerivation {
+buildPostgresExtension {
   pname = "pg_hint_plan";
   inherit (source) version;
 
@@ -40,14 +40,6 @@ stdenv.mkDerivation {
     substituteInPlace Makefile --replace "LDFLAGS+=-Wl,--build-id" ""
   '';
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib pg_hint_plan${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "Extension to tweak PostgreSQL execution plans using so-called 'hints' in SQL comments";
     homepage = "https://github.com/ossc-db/pg_hint_plan";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_hll.nix b/pkgs/servers/sql/postgresql/ext/pg_hll.nix
index a60601aef569a3..c0699f64f90e16 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_hll.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_hll.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_hll";
   version = "2.18";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "citusdata";
     repo   = "postgresql-hll";
@@ -13,12 +11,6 @@ stdenv.mkDerivation rec {
     hash   = "sha256-Latdxph1Ura8yKEokEjalJ+/GY+pAKOT3GXjuLprj6c=";
   };
 
-  installPhase = ''
-    install -D -t $out/lib hll${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
- '';
-
   meta = with lib; {
     description = "HyperLogLog for PostgreSQL";
     homepage    = "https://github.com/citusdata/postgresql-hll";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_ivm.nix b/pkgs/servers/sql/postgresql/ext/pg_ivm.nix
index 46c01251d503ea..620087fb2dbf4b 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_ivm.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_ivm.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_ivm";
   version = "1.8";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-HncWX3jx9sEvxGGMMZ9QT4tDQ4JYbkNrFw2aZHgCVE8=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib pg_ivm${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "Materialized views with IVM (Incremental View Maintenance) for PostgreSQL";
     homepage = "https://github.com/sraoss/pg_ivm";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_libversion.nix b/pkgs/servers/sql/postgresql/ext/pg_libversion.nix
index b5c3ad6acab823..db51532dca9737 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_libversion.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_libversion.nix
@@ -5,9 +5,10 @@
 , pkg-config
 , postgresql
 , libversion
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pg_libversion";
   version = "2.0.1";
 
@@ -23,20 +24,9 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   buildInputs = [
-    postgresql
     libversion
   ];
 
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/lib libversion${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-
-    runHook postInstall
-  '';
-
   passthru.updateScript = gitUpdater { };
 
   meta = with lib; {
diff --git a/pkgs/servers/sql/postgresql/ext/pg_net.nix b/pkgs/servers/sql/postgresql/ext/pg_net.nix
index a86f53eeef05f7..e7c864c6ccd8d3 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_net.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_net.nix
@@ -1,10 +1,10 @@
-{ lib, stdenv, fetchFromGitHub, curl, postgresql }:
+{ lib, stdenv, fetchFromGitHub, curl, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_net";
   version = "0.8.0";
 
-  buildInputs = [ curl postgresql ];
+  buildInputs = [ curl ];
 
   src = fetchFromGitHub {
     owner  = "supabase";
@@ -15,14 +15,6 @@ stdenv.mkDerivation rec {
 
   env.NIX_CFLAGS_COMPILE = "-Wno-error";
 
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp sql/*.sql $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Async networking for Postgres";
     homepage    = "https://github.com/supabase/pg_net";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_partman.nix b/pkgs/servers/sql/postgresql/ext/pg_partman.nix
index 87ee50411b7541..d2832c78b207a0 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_partman.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_partman.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_partman";
   version = "5.1.0";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "pgpartman";
     repo   = pname;
@@ -13,15 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-GrVOJ5ywZMyqyDroYDLdKkXDdIJSDGhDfveO/ZvrmYs=";
   };
 
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp src/*${postgresql.dlSuffix} $out/lib
-    cp updates/*     $out/share/postgresql/extension
-    cp -r sql/*      $out/share/postgresql/extension
-    cp *.control     $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Partition management extension for PostgreSQL";
     homepage    = "https://github.com/pgpartman/pg_partman";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_rational.nix b/pkgs/servers/sql/postgresql/ext/pg_rational.nix
index df80ea49a541a4..6a615475e0d6da 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_rational.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_rational.nix
@@ -2,9 +2,10 @@
 , fetchFromGitHub
 , lib
 , postgresql
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_rational";
   version = "0.0.2";
 
@@ -15,20 +16,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-Sp5wuX2nP3KGyWw7MFa11rI1CPIKIWBt8nvBSsASIEw=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-
-    runHook postInstall
-  '';
-
   meta = with lib; {
     description = "Precise fractional arithmetic for PostgreSQL";
     homepage    = "https://github.com/begriffs/pg_rational";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_relusage.nix b/pkgs/servers/sql/postgresql/ext/pg_relusage.nix
index 1fe9fd3cac876c..43f5f7378043d6 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_relusage.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_relusage.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_relusage";
   version = "0.0.1";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "adept";
     repo   = pname;
@@ -13,12 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "8hJNjQ9MaBk3J9a73l+yQMwMW/F2N8vr5PO2o+5GvYs=";
   };
 
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "pg_relusage extension for PostgreSQL: discover and log the relations used in your statements";
     homepage    = "https://github.com/adept/pg_relusage";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_repack.nix b/pkgs/servers/sql/postgresql/ext/pg_repack.nix
index b251e9e752f6b2..681e0e3533e5a3 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_repack.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_repack.nix
@@ -4,13 +4,14 @@
 , postgresql
 , postgresqlTestExtension
 , testers
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pg_repack";
   version = "1.5.0";
 
-  buildInputs = postgresql.buildInputs ++ [ postgresql ];
+  buildInputs = postgresql.buildInputs;
 
   src = fetchFromGitHub {
     owner = "reorg";
@@ -19,12 +20,6 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-do80phyMxwcRIkYyUt9z02z7byNQhK+pbSaCUmzG+4c=";
   };
 
-  installPhase = ''
-    install -D bin/pg_repack -t $out/bin/
-    install -D lib/pg_repack${postgresql.dlSuffix} -t $out/lib/
-    install -D lib/{pg_repack--${finalAttrs.version}.sql,pg_repack.control} -t $out/share/postgresql/extension
-  '';
-
   passthru.tests = {
     version = testers.testVersion {
       package = finalAttrs.finalPackage;
diff --git a/pkgs/servers/sql/postgresql/ext/pg_roaringbitmap.nix b/pkgs/servers/sql/postgresql/ext/pg_roaringbitmap.nix
index 682275fbf15caf..7e7a29f47b16a9 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_roaringbitmap.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_roaringbitmap.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestHook }:
+{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestHook, buildPostgresExtension }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pg_roaringbitmap";
   version = "0.5.4";
 
@@ -11,16 +11,6 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-E6vqawnsRsAIajGDgJcTUWV1H8GFFboTjhmVfemUGbs=";
   };
 
-  buildInputs = [
-    postgresql
-  ];
-
-  installPhase = ''
-    install -D -t $out/lib roaringbitmap${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension roaringbitmap-*.sql
-    install -D -t $out/share/postgresql/extension roaringbitmap.control
-  '';
-
   meta = with lib; {
     description = "RoaringBitmap extension for PostgreSQL";
     homepage = "https://github.com/ChenHuajun/pg_roaringbitmap";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_safeupdate.nix b/pkgs/servers/sql/postgresql/ext/pg_safeupdate.nix
index 6637c98c95654c..728a0ea37a0d37 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_safeupdate.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_safeupdate.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
 with {
   "12" = {
@@ -23,12 +23,10 @@ with {
   };
 }."${lib.versions.major postgresql.version}" or (throw "pg_safeupdate: version specification for pg ${postgresql.version} missing.");
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg-safeupdate";
   inherit version;
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "eradman";
     repo   = pname;
@@ -36,10 +34,6 @@ stdenv.mkDerivation rec {
     inherit sha256;
   };
 
-  installPhase = ''
-    install -D safeupdate${postgresql.dlSuffix} -t $out/lib
-  '';
-
   meta = with lib; {
     description = "Simple extension to PostgreSQL that requires criteria for UPDATE and DELETE";
     homepage    = "https://github.com/eradman/pg-safeupdate";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_similarity.nix b/pkgs/servers/sql/postgresql/ext/pg_similarity.nix
index a0669331055b03..10f61e3f7f8982 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_similarity.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_similarity.nix
@@ -1,9 +1,9 @@
-{ stdenv, lib, fetchFromGitHub, gcc, postgresql }:
-
-stdenv.mkDerivation {
+{ stdenv, lib, fetchFromGitHub, gcc, postgresql, buildPostgresExtension }:
 
+buildPostgresExtension {
   pname = "pg_similarity";
   version = "1.0";
+
   src = fetchFromGitHub {
     owner = "eulerto";
     repo = "pg_similarity";
@@ -11,15 +11,10 @@ stdenv.mkDerivation {
     sha256 = "1z4v4r2yccdr8kz3935fnk1bc5vj0qj0apscldyap4wxlyi89xim";
   };
 
-  buildInputs = [ postgresql gcc ];
+  buildInputs = [ gcc ];
 
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D pg_similarity${postgresql.dlSuffix} -t $out/lib/
-    install -D ./{pg_similarity--unpackaged--1.0.sql,pg_similarity--1.0.sql,pg_similarity.control} -t $out/share/postgresql/extension
-  '';
-
   meta = {
     description = "Extension to support similarity queries on PostgreSQL";
     longDescription = ''
diff --git a/pkgs/servers/sql/postgresql/ext/pg_squeeze.nix b/pkgs/servers/sql/postgresql/ext/pg_squeeze.nix
index 6e09fe9a73188c..a9bc41f2774eec 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_squeeze.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_squeeze.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestExtension }:
+{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestExtension, buildPostgresExtension }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pg_squeeze";
   version = "1.6.2";
 
@@ -11,20 +11,6 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-YS13iIpQ4NJe0N6bRVa2RDxEMwEzBc2mjNYM5/Vqjn8=";
   };
 
-  buildInputs = [
-    postgresql
-  ];
-
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/lib pg_squeeze${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension pg_squeeze-*.sql
-    install -D -t $out/share/postgresql/extension pg_squeeze.control
-
-    runHook postInstall
-  '';
-
   passthru.tests.extension = postgresqlTestExtension {
     inherit (finalAttrs) finalPackage;
     postgresqlExtraSettings = ''
diff --git a/pkgs/servers/sql/postgresql/ext/pg_topn.nix b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
index 2a11417c908312..e06bbf4728f5d9 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_topn.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_topn";
   version = "2.6.0";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "citusdata";
     repo   = "postgresql-topn";
@@ -13,14 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-kq3P+a9NWLKN/CsISGHfInbeL4ex4KIeDhTKyyN7FVE=";
   };
 
-  installPhase = ''
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Efficient querying of 'top values' for PostgreSQL";
     homepage    = "https://github.com/citusdata/postgresql-topn";
diff --git a/pkgs/servers/sql/postgresql/ext/pg_uuidv7.nix b/pkgs/servers/sql/postgresql/ext/pg_uuidv7.nix
index 80afe05db808ef..7469d9897a8dc7 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_uuidv7.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_uuidv7.nix
@@ -2,14 +2,13 @@
 , stdenv
 , fetchFromGitHub
 , postgresql
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pg_uuidv7";
   version = "1.5.0";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner = "fboulnois";
     repo = "pg_uuidv7";
@@ -17,11 +16,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-oVyRtjl3KsD3j96qvQb8bFLMhoWO81OudOL4wVXrjzI=";
   };
 
-  installPhase = ''
-      install -D -t $out/lib pg_uuidv7${postgresql.dlSuffix}
-      install -D {sql/pg_uuidv7--${lib.versions.majorMinor version}.sql,pg_uuidv7.control} -t $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Tiny Postgres extension to create version 7 UUIDs";
     homepage = "https://github.com/fboulnois/pg_uuidv7";
diff --git a/pkgs/servers/sql/postgresql/ext/pgaudit.nix b/pkgs/servers/sql/postgresql/ext/pgaudit.nix
index f4c03d611f5037..2302ba193f4956 100644
--- a/pkgs/servers/sql/postgresql/ext/pgaudit.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgaudit.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, libkrb5, openssl, postgresql }:
+{ lib, stdenv, fetchFromGitHub, libkrb5, openssl, postgresql, buildPostgresExtension }:
 
 let
   source = {
@@ -24,7 +24,7 @@ let
     };
   }.${lib.versions.major postgresql.version} or (throw "Source for pgaudit is not available for ${postgresql.version}");
 in
-stdenv.mkDerivation {
+buildPostgresExtension {
   pname = "pgaudit";
   inherit (source) version;
 
@@ -35,16 +35,10 @@ stdenv.mkDerivation {
     hash = source.hash;
   };
 
-  buildInputs = [ libkrb5 openssl postgresql ];
+  buildInputs = [ libkrb5 openssl ];
 
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D -t $out/lib pgaudit${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "Open Source PostgreSQL Audit Logging";
     homepage = "https://github.com/pgaudit/pgaudit";
diff --git a/pkgs/servers/sql/postgresql/ext/pgjwt.nix b/pkgs/servers/sql/postgresql/ext/pgjwt.nix
index a90502c35a4e8e..a22c767853f539 100644
--- a/pkgs/servers/sql/postgresql/ext/pgjwt.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgjwt.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, unstableGitUpdater, nixosTests, postgresqlTestExtension }:
+{ lib, stdenv, fetchFromGitHub, postgresql, unstableGitUpdater, nixosTests, postgresqlTestExtension, buildPostgresExtension }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pgjwt";
   version = "0-unstable-2023-03-02";
 
@@ -11,12 +11,6 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-nDZEDf5+sFc1HDcG2eBNQj+kGcdAYRXJseKi9oww+JU=";
   };
 
-  dontBuild = true;
-  installPhase = ''
-    mkdir -p $out/share/postgresql/extension
-    cp pg*sql *.control $out/share/postgresql/extension
-  '';
-
   passthru.updateScript = unstableGitUpdater { };
 
   passthru.tests = {
diff --git a/pkgs/servers/sql/postgresql/ext/pgmq.nix b/pkgs/servers/sql/postgresql/ext/pgmq.nix
index 2cbf3caa433389..8a5319efb66b02 100644
--- a/pkgs/servers/sql/postgresql/ext/pgmq.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgmq.nix
@@ -3,9 +3,10 @@
   stdenv,
   fetchFromGitHub,
   postgresql,
+  buildPostgresqlExtension,
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresqlExtension rec {
   pname = "pgmq";
   version = "1.4.4";
 
@@ -20,17 +21,6 @@ stdenv.mkDerivation rec {
 
   dontConfigure = true;
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/share/postgresql/extension sql/*.sql
-    install -D -t $out/share/postgresql/extension *.control
-
-    runHook postInstall
-  '';
-
   meta = {
     description = "Lightweight message queue like AWS SQS and RSMQ but on Postgres";
     homepage = "https://tembo.io/pgmq";
diff --git a/pkgs/servers/sql/postgresql/ext/pgroonga.nix b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
index 0ba7fa093820c2..734892f4b24dde 100644
--- a/pkgs/servers/sql/postgresql/ext/pgroonga.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchurl, pkg-config, postgresql, msgpack-c, groonga }:
+{ lib, stdenv, fetchurl, pkg-config, postgresql, msgpack-c, groonga, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pgroonga";
   version = "3.1.8";
 
@@ -10,23 +10,13 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ postgresql msgpack-c groonga ];
+  buildInputs = [ msgpack-c groonga ];
 
   makeFlags = [
     "HAVE_MSGPACK=1"
     "MSGPACK_PACKAGE_NAME=msgpack-c"
   ];
 
-  installPhase = ''
-    install -D pgroonga${postgresql.dlSuffix} -t $out/lib/
-    install -D pgroonga.control -t $out/share/postgresql/extension
-    install -D data/pgroonga-*.sql -t $out/share/postgresql/extension
-
-    install -D pgroonga_database${postgresql.dlSuffix} -t $out/lib/
-    install -D pgroonga_database.control -t $out/share/postgresql/extension
-    install -D data/pgroonga_database-*.sql -t $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "PostgreSQL extension to use Groonga as the index";
     longDescription = ''
diff --git a/pkgs/servers/sql/postgresql/ext/pgrouting.nix b/pkgs/servers/sql/postgresql/ext/pgrouting.nix
index d67a21755a0670..35a996bc562e5e 100644
--- a/pkgs/servers/sql/postgresql/ext/pgrouting.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgrouting.nix
@@ -1,11 +1,11 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, perl, cmake, boost }:
+{ lib, stdenv, fetchFromGitHub, postgresql, perl, cmake, boost, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pgrouting";
   version = "3.6.3";
 
   nativeBuildInputs = [ cmake perl ];
-  buildInputs = [ postgresql boost ];
+  buildInputs = [ boost ];
 
   src = fetchFromGitHub {
     owner  = "pgRouting";
@@ -14,12 +14,6 @@ stdenv.mkDerivation rec {
     hash   = "sha256-VCoapUM7Vh4W1DUE/gWQ9YIRLbw63XlOWsgajJW+XNU=";
   };
 
-  installPhase = ''
-    install -D lib/*.so                        -t $out/lib
-    install -D sql/pgrouting--${version}.sql   -t $out/share/postgresql/extension
-    install -D sql/common/pgrouting.control    -t $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "PostgreSQL/PostGIS extension that provides geospatial routing functionality";
     homepage    = "https://pgrouting.org/";
diff --git a/pkgs/servers/sql/postgresql/ext/pgsodium.nix b/pkgs/servers/sql/postgresql/ext/pgsodium.nix
index 59ddfcd74c8c55..33c2358277e282 100644
--- a/pkgs/servers/sql/postgresql/ext/pgsodium.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgsodium.nix
@@ -4,9 +4,10 @@
 , libsodium
 , postgresql
 , postgresqlTestExtension
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pgsodium";
   version = "3.1.9";
 
@@ -19,20 +20,11 @@ stdenv.mkDerivation (finalAttrs: {
 
   buildInputs = [
     libsodium
-    postgresql
   ];
 
-  installPhase = ''
-    runHook preInstall
-
-    install -D -t $out/lib pgsodium${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension sql/pgsodium-*.sql
-    install -D -t $out/share/postgresql/extension pgsodium.control
-
+  postInstall = ''
     install -D -t $out/share/pgsodium/getkey_scripts getkey_scripts/*
     ln -s $out/share/pgsodium/getkey_scripts/pgsodium_getkey_urandom.sh $out/share/postgresql/extension/pgsodium_getkey
-
-    runHook postInstall
   '';
 
   passthru.tests.extension = postgresqlTestExtension {
diff --git a/pkgs/servers/sql/postgresql/ext/pgsql-http.nix b/pkgs/servers/sql/postgresql/ext/pgsql-http.nix
index bfe9052acf5873..975bd3dbf81872 100644
--- a/pkgs/servers/sql/postgresql/ext/pgsql-http.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgsql-http.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, curl, postgresql }:
+{ lib, stdenv, fetchFromGitHub, curl, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pgsql-http";
   version = "1.6.0";
 
@@ -11,13 +11,7 @@ stdenv.mkDerivation rec {
     hash = "sha256-CPHfx7vhWfxkXsoKTzyFuTt47BPMvzi/pi1leGcuD60=";
   };
 
-  buildInputs = [ curl postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
+  buildInputs = [ curl ];
 
   meta = with lib; {
     description = "HTTP client for PostgreSQL, retrieve a web page from inside the database";
diff --git a/pkgs/servers/sql/postgresql/ext/pgtap.nix b/pkgs/servers/sql/postgresql/ext/pgtap.nix
index 24ad1f610e8f43..f34e3f2859f406 100644
--- a/pkgs/servers/sql/postgresql/ext/pgtap.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgtap.nix
@@ -1,5 +1,6 @@
 { lib
 , stdenv
+, buildPostgresExtension
 , fetchFromGitHub
 , perl
 , perlPackages
@@ -8,7 +9,7 @@
 , which
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "pgtap";
   version = "1.3.3";
 
@@ -21,10 +22,6 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [ postgresql perl perlPackages.TAPParserSourceHandlerpgTAP which ];
 
-  installPhase = ''
-    install -D {sql/pgtap--${finalAttrs.version}.sql,pgtap.control} -t $out/share/postgresql/extension
-  '';
-
   passthru.tests.extension = stdenv.mkDerivation {
     name = "pgtap-test";
     dontUnpack = true;
diff --git a/pkgs/servers/sql/postgresql/ext/pgvector.nix b/pkgs/servers/sql/postgresql/ext/pgvector.nix
index 619c5e7ab24d33..7794899009b378 100644
--- a/pkgs/servers/sql/postgresql/ext/pgvector.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgvector.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "pgvector";
   version = "0.6.2";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-r+TpFJg6WrMn0L2B7RpmSRvw3XxpHzMRtpFWDCzLvgs=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib vector${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension sql/vector-*.sql
-    install -D -t $out/share/postgresql/extension vector.control
-  '';
-
   meta = with lib; {
     description = "Open-source vector similarity search for PostgreSQL";
     homepage = "https://github.com/pgvector/pgvector";
diff --git a/pkgs/servers/sql/postgresql/ext/plpgsql_check.nix b/pkgs/servers/sql/postgresql/ext/plpgsql_check.nix
index e03a3bf51fe55e..cbc3a98da20be1 100644
--- a/pkgs/servers/sql/postgresql/ext/plpgsql_check.nix
+++ b/pkgs/servers/sql/postgresql/ext/plpgsql_check.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestExtension }:
+{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestExtension, buildPostgresExtension }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "plpgsql-check";
   version = "2.7.5";
 
@@ -11,14 +11,6 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-CD/G/wX6o+mC6gowlpFe1DdJWyh3cB9wxSsW2GXrENE=";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   passthru.tests.extension = postgresqlTestExtension {
     inherit (finalAttrs) finalPackage;
     sql = "CREATE EXTENSION plpgsql_check;";
diff --git a/pkgs/servers/sql/postgresql/ext/plr.nix b/pkgs/servers/sql/postgresql/ext/plr.nix
index 05d22c19a8b0ce..19c8c109bedc26 100644
--- a/pkgs/servers/sql/postgresql/ext/plr.nix
+++ b/pkgs/servers/sql/postgresql/ext/plr.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, pkg-config, R, postgresql }:
+{ lib, stdenv, fetchFromGitHub, pkg-config, R, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "plr";
   version = "8.4.6";
 
@@ -12,15 +12,10 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ R postgresql ];
+  buildInputs = [ R ];
 
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D plr${postgresql.dlSuffix} -t $out/lib/
-    install -D {plr--*.sql,plr.control} -t $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "PL/R - R Procedural Language for PostgreSQL";
     homepage = "https://github.com/postgres-plr/plr";
diff --git a/pkgs/servers/sql/postgresql/ext/plv8/default.nix b/pkgs/servers/sql/postgresql/ext/plv8/default.nix
index e0dbc19e353fa2..d6d0e62b151c54 100644
--- a/pkgs/servers/sql/postgresql/ext/plv8/default.nix
+++ b/pkgs/servers/sql/postgresql/ext/plv8/default.nix
@@ -5,6 +5,7 @@
 , perl
 , postgresql
 , jitSupport
+, buildPostgresExtension
 # For test
 , runCommand
 , coreutils
@@ -13,7 +14,7 @@
 
 let
   libv8 = nodejs_20.libv8;
-in stdenv.mkDerivation (finalAttrs: {
+in buildPostgresExtension (finalAttrs: {
   pname = "plv8";
   version = "3.2.2";
 
@@ -36,7 +37,6 @@ in stdenv.mkDerivation (finalAttrs: {
 
   buildInputs = [
     libv8
-    postgresql
   ];
 
   buildFlags = [ "all" ];
@@ -48,11 +48,6 @@ in stdenv.mkDerivation (finalAttrs: {
     "V8_OUTDIR=${libv8}/lib"
   ];
 
-  installFlags = [
-    # PGXS only supports installing to postgresql prefix so we need to redirect this
-    "DESTDIR=${placeholder "out"}"
-  ];
-
   # No configure script.
   dontConfigure = true;
 
@@ -60,14 +55,6 @@ in stdenv.mkDerivation (finalAttrs: {
     patchShebangs ./generate_upgrade.sh
   '';
 
-  postInstall = ''
-    # Move the redirected to proper directory.
-    # There appear to be no references to the install directories
-    # so changing them does not cause issues.
-    mv "$out/nix/store"/*/* "$out"
-    rmdir "$out/nix/store"/* "$out/nix/store" "$out/nix"
-  '';
-
   passthru = {
     tests =
       let
diff --git a/pkgs/servers/sql/postgresql/ext/postgis.nix b/pkgs/servers/sql/postgresql/ext/postgis.nix
index aa62c778a3fda5..04fd6ed0fef80d 100644
--- a/pkgs/servers/sql/postgresql/ext/postgis.nix
+++ b/pkgs/servers/sql/postgresql/ext/postgis.nix
@@ -21,12 +21,13 @@
   nixosTests,
   jitSupport,
   llvm,
+  buildPostgresExtension,
 }:
 
 let
   gdal = gdalMinimal;
 in
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "postgis";
   version = "3.5.0";
 
@@ -42,7 +43,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     libxml2
-    postgresql
     geos
     proj
     gdal
@@ -68,20 +68,18 @@ stdenv.mkDerivation rec {
   # postgis config directory assumes /include /lib from the same root for json-c library
   env.NIX_LDFLAGS = "-L${lib.getLib json_c}/lib";
 
+  setOutputFlags = false;
   preConfigure = ''
     sed -i 's@/usr/bin/file@${file}/bin/file@' configure
-    configureFlags="--datadir=$out/share/postgresql --datarootdir=$out/share/postgresql --bindir=$out/bin --docdir=$doc/share/doc/${pname} --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev} --disable-extension-upgrades-install"
-
-    makeFlags="PERL=${perl}/bin/perl datadir=$out/share/postgresql pkglibdir=$out/lib bindir=$out/bin docdir=$doc/share/doc/${pname}"
   '';
+
+  configureFlags = [
+    "--with-gdalconfig=${gdal}/bin/gdal-config"
+    "--with-jsondir=${json_c.dev}"
+    "--disable-extension-upgrades-install"
+  ];
+
   postConfigure = ''
-    sed -i "s|@mkdir -p \$(DESTDIR)\$(PGSQL_BINDIR)||g ;
-            s|\$(DESTDIR)\$(PGSQL_BINDIR)|$prefix/bin|g
-            " \
-        "raster/loader/Makefile";
-    sed -i "s|\$(DESTDIR)\$(PGSQL_BINDIR)|$prefix/bin|g
-            " \
-        "raster/scripts/python/Makefile";
     mkdir -p $out/bin
 
     # postgis' build system assumes it is being installed to the same place as postgresql, and looks
@@ -89,12 +87,13 @@ stdenv.mkDerivation rec {
     ln -s ${postgresql}/bin/postgres $out/bin/postgres
   '';
 
+  makeFlags = [
+    "PERL=${perl}/bin/perl"
+  ];
+
   doCheck = stdenv.hostPlatform.isLinux;
 
   preCheck = ''
-    substituteInPlace regress/run_test.pl --replace-fail "/share/contrib/postgis" "$out/share/postgresql/contrib/postgis"
-    substituteInPlace regress/Makefile --replace-fail 's,\$$libdir,$(REGRESS_INSTALLDIR)/lib,g' "s,\\$\$libdir,$PWD/regress/00-regress-install$out/lib,g" \
-      --replace-fail '$(REGRESS_INSTALLDIR)/share/contrib/postgis/*.sql' "$PWD/regress/00-regress-install$out/share/postgresql/contrib/postgis/*.sql"
     substituteInPlace doc/postgis-out.xml --replace-fail "http://docbook.org/xml/5.0/dtd/docbook.dtd" "${docbook5}/xml/dtd/docbook/docbookx.dtd"
     # The test suite hardcodes it to use /tmp.
     export PGIS_REG_TMPDIR="$TMPDIR/pgis_reg"
diff --git a/pkgs/servers/sql/postgresql/ext/repmgr.nix b/pkgs/servers/sql/postgresql/ext/repmgr.nix
index 565f3fdaf60dca..08185982d33d9a 100644
--- a/pkgs/servers/sql/postgresql/ext/repmgr.nix
+++ b/pkgs/servers/sql/postgresql/ext/repmgr.nix
@@ -5,9 +5,10 @@
 , flex
 , curl
 , json_c
+, buildPostgresExtension
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "repmgr";
   version = "5.4.1";
 
@@ -20,16 +21,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ flex ];
 
-  buildInputs = postgresql.buildInputs ++ [ postgresql curl json_c ];
-
-  installPhase = ''
-    mkdir -p $out/{bin,lib,share/postgresql/extension}
-
-    cp repmgr{,d} $out/bin
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql      $out/share/postgresql/extension
-    cp *.control  $out/share/postgresql/extension
-  '';
+  buildInputs = postgresql.buildInputs ++ [ curl json_c ];
 
   meta = with lib; {
     homepage = "https://repmgr.org/";
diff --git a/pkgs/servers/sql/postgresql/ext/rum.nix b/pkgs/servers/sql/postgresql/ext/rum.nix
index 629fddfcbb30f2..02474a99fbbc88 100644
--- a/pkgs/servers/sql/postgresql/ext/rum.nix
+++ b/pkgs/servers/sql/postgresql/ext/rum.nix
@@ -4,9 +4,10 @@
   fetchFromGitHub,
   postgresql,
   postgresqlTestHook,
+  buildPostgresExtension,
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+buildPostgresExtension (finalAttrs: {
   pname = "rum";
   version = "1.3.14";
 
@@ -17,16 +18,8 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-VsfpxQqRBu9bIAP+TfMRXd+B3hSjuhU2NsutocNiCt8=";
   };
 
-  buildInputs = [ postgresql ];
-
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.control
-    install -D -t $out/share/postgresql/extension *.sql
-  '';
-
   passthru.tests.extension = stdenv.mkDerivation {
     inherit (finalAttrs) version;
     pname = "rum-test";
diff --git a/pkgs/servers/sql/postgresql/ext/smlar.nix b/pkgs/servers/sql/postgresql/ext/smlar.nix
index 12fdd79cc8f42b..f79793e2fa37de 100644
--- a/pkgs/servers/sql/postgresql/ext/smlar.nix
+++ b/pkgs/servers/sql/postgresql/ext/smlar.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchgit, postgresql }:
+{ lib, stdenv, fetchgit, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "smlar-unstable";
   version = "2021-11-08";
 
@@ -10,16 +10,8 @@ stdenv.mkDerivation rec {
     hash = "sha256-AC6w7uYw0OW70pQpWbK1A3rkCnMvTJzTCAdFiY3rO7A=";
   };
 
-  buildInputs = [ postgresql ];
-
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D -t $out/lib *.so
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
-  '';
-
   meta = with lib; {
     description = "Compute similary of any one-dimensional arrays";
     homepage = "http://sigaev.ru/git/gitweb.cgi?p=smlar.git";
diff --git a/pkgs/servers/sql/postgresql/ext/system_stats.nix b/pkgs/servers/sql/postgresql/ext/system_stats.nix
index c1700fc0380d66..ab437f86e0a02b 100644
--- a/pkgs/servers/sql/postgresql/ext/system_stats.nix
+++ b/pkgs/servers/sql/postgresql/ext/system_stats.nix
@@ -3,13 +3,12 @@
   lib,
   stdenv,
   postgresql,
+  buildPostgresExtension,
 }:
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "system_stats";
   version = "3.2";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner = "EnterpriseDB";
     repo = "system_stats";
@@ -17,18 +16,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-/xXnui0S0ZjRw7P8kMAgttHVv8T41aOhM3pM8P0OTig=";
   };
 
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out/{lib,share/postgresql/extension}
-
-    cp *${postgresql.dlSuffix} $out/lib
-    cp *.sql     $out/share/postgresql/extension
-    cp *.control $out/share/postgresql/extension
-
-    runHook postInstall
-  '';
-
   meta = with lib; {
     description = "A Postgres extension for exposing system metrics such as CPU, memory and disk information";
     homepage = "https://github.com/EnterpriseDB/system_stats";
diff --git a/pkgs/servers/sql/postgresql/ext/tds_fdw.nix b/pkgs/servers/sql/postgresql/ext/tds_fdw.nix
index 4a192cda9aa338..50069b53758b9a 100644
--- a/pkgs/servers/sql/postgresql/ext/tds_fdw.nix
+++ b/pkgs/servers/sql/postgresql/ext/tds_fdw.nix
@@ -1,11 +1,11 @@
-{ lib, stdenv, fetchFromGitHub, postgresql, freetds, unstableGitUpdater }:
+{ lib, stdenv, fetchFromGitHub, postgresql, freetds, unstableGitUpdater, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "tds_fdw";
   # Move to stable version when it's released.
   version = "2.0.3-unstable-2024-02-10";
 
-  buildInputs = [ postgresql freetds ];
+  buildInputs = [ freetds ];
 
   src = fetchFromGitHub {
     owner  = "tds-fdw";
@@ -14,13 +14,6 @@ stdenv.mkDerivation rec {
     hash   = "sha256-3J8wzk0YIxRPhALd5PgVW000hzQw3r4rTrnqg9uB/Bo=";
   };
 
-  installPhase = ''
-    version="$(sed -En "s,^default_version *= *'([^']*)'.*,\1,p" tds_fdw.control)"
-    install -D tds_fdw${postgresql.dlSuffix} -t $out/lib
-    install -D sql/tds_fdw.sql    "$out/share/postgresql/extension/tds_fdw--$version.sql"
-    install -D tds_fdw.control -t $out/share/postgresql/extension
-  '';
-
   passthru.updateScript = unstableGitUpdater {
     tagPrefix = "v";
   };
diff --git a/pkgs/servers/sql/postgresql/ext/temporal_tables.nix b/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
index cb401829b2425d..e5bd03423b3ff4 100644
--- a/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
+++ b/pkgs/servers/sql/postgresql/ext/temporal_tables.nix
@@ -1,11 +1,9 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "temporal_tables";
   version = "1.2.2";
 
-  buildInputs = [ postgresql ];
-
   src = fetchFromGitHub {
     owner  = "arkhipov";
     repo   = "temporal_tables";
@@ -13,12 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-7+DCSPAPhsokWDq/5IXNhd7jY6FfzxxUjlsg/VJeD3k=";
   };
 
-  installPhase = ''
-    install -D -t $out/lib temporal_tables${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension *.sql
-    install -D -t $out/share/postgresql/extension *.control
- '';
-
   meta = with lib; {
     description = "Temporal Tables PostgreSQL Extension";
     homepage    = "https://github.com/arkhipov/temporal_tables";
diff --git a/pkgs/servers/sql/postgresql/ext/timescaledb.nix b/pkgs/servers/sql/postgresql/ext/timescaledb.nix
index bd2d2d3b74be64..f2224ad7590fcd 100644
--- a/pkgs/servers/sql/postgresql/ext/timescaledb.nix
+++ b/pkgs/servers/sql/postgresql/ext/timescaledb.nix
@@ -1,11 +1,11 @@
-{ lib, stdenv, fetchFromGitHub, cmake, postgresql, openssl, libkrb5, nixosTests, enableUnfree ? true }:
+{ lib, stdenv, fetchFromGitHub, cmake, postgresql, openssl, libkrb5, nixosTests, enableUnfree ? true, buildPostgresExtension }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "timescaledb${lib.optionalString (!enableUnfree) "-apache"}";
   version = "2.14.2";
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ postgresql openssl libkrb5 ];
+  buildInputs = [ openssl libkrb5 ];
 
   src = fetchFromGitHub {
     owner = "timescale";
diff --git a/pkgs/servers/sql/postgresql/ext/tsearch_extras.nix b/pkgs/servers/sql/postgresql/ext/tsearch_extras.nix
index b42095acd715c4..0841aa49035cb8 100644
--- a/pkgs/servers/sql/postgresql/ext/tsearch_extras.nix
+++ b/pkgs/servers/sql/postgresql/ext/tsearch_extras.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, postgresql }:
+{ lib, stdenv, fetchFromGitHub, postgresql, buildPostgresExtension }:
 
-stdenv.mkDerivation {
+buildPostgresExtension {
   pname = "tsearch-extras";
   version = "0.4";
 
@@ -11,13 +11,6 @@ stdenv.mkDerivation {
     sha256 = "18j0saqblg3jhrz38splk173xjwdf32c67ymm18m8n5y94h8d2ba";
   };
 
-  buildInputs = [ postgresql ];
-
-  installPhase = ''
-    install -D tsearch_extras${postgresql.dlSuffix} -t $out/lib/
-    install -D ./{tsearch_extras--1.0.sql,tsearch_extras.control} -t $out/share/postgresql/extension
-  '';
-
   meta = with lib; {
     description = "Provides a few PostgreSQL functions for a lower-level data full text search";
     homepage = "https://github.com/zulip/tsearch_extras/";
diff --git a/pkgs/servers/sql/postgresql/ext/tsja.nix b/pkgs/servers/sql/postgresql/ext/tsja.nix
index f0b9238f59ef22..ed1aacca53d91b 100644
--- a/pkgs/servers/sql/postgresql/ext/tsja.nix
+++ b/pkgs/servers/sql/postgresql/ext/tsja.nix
@@ -2,7 +2,6 @@
 , fetchzip
 , nixosTests
 , stdenv
-
 , mecab
 , postgresql
 }:
diff --git a/pkgs/servers/sql/postgresql/ext/wal2json.nix b/pkgs/servers/sql/postgresql/ext/wal2json.nix
index 4a1c9b18b13b50..ce954030e45394 100644
--- a/pkgs/servers/sql/postgresql/ext/wal2json.nix
+++ b/pkgs/servers/sql/postgresql/ext/wal2json.nix
@@ -4,9 +4,10 @@
   callPackage,
   fetchFromGitHub,
   postgresql,
+  buildPostgresExtension,
 }:
 
-stdenv.mkDerivation rec {
+buildPostgresExtension rec {
   pname = "wal2json";
   version = "2.6";
 
@@ -17,15 +18,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-+QoACPCKiFfuT2lJfSUmgfzC5MXf75KpSoc2PzPxKyM=";
   };
 
-  buildInputs = [ postgresql ];
-
   makeFlags = [ "USE_PGXS=1" ];
 
-  installPhase = ''
-    install -D -t $out/lib *${postgresql.dlSuffix}
-    install -D -t $out/share/postgresql/extension sql/*.sql
-  '';
-
   passthru.tests.wal2json = lib.recurseIntoAttrs (
     callPackage ../../../../../nixos/tests/postgresql-wal2json.nix {
       inherit (stdenv) system;
diff --git a/pkgs/servers/sql/postgresql/generic.nix b/pkgs/servers/sql/postgresql/generic.nix
index 539a4d05019d87..02072e51233613 100644
--- a/pkgs/servers/sql/postgresql/generic.nix
+++ b/pkgs/servers/sql/postgresql/generic.nix
@@ -287,6 +287,7 @@ let
               '';
               installPhase = "touch $out";
             } // extraArgs);
+          buildPostgresExtension = newSuper.callPackage ./buildPostgresExtension.nix {};
         };
         newSelf = self // scope;
         newSuper = { callPackage = newScope (scope // this.pkgs); };