diff --git a/.gitignore b/.gitignore
index cb36b61..e88b119 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,6 @@ a.out
 config
 src/codegen.c
 .session.mk
+
+# vscode C/C++ plugin generated files
+.vscode
diff --git a/src/globals.c b/src/globals.c
index 992bb78..b6631df 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -5,6 +5,9 @@
  * file "LICENSE" for information on usage and redistribution of this file.
  */
 
+#include <stdbool.h>
+#include <stdlib.h>
+
 /* Global objects */
 
 block_list_t BLOCKS;
diff --git a/src/lexer.c b/src/lexer.c
index f23517d..4933ea6 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -5,6 +5,8 @@
  * file "LICENSE" for information on usage and redistribution of this file.
  */
 
+#include <stdbool.h>
+
 /* lexer tokens */
 typedef enum {
     T_start, /* FIXME: it was intended to start the state machine. */
diff --git a/src/parser.c b/src/parser.c
index 862fe4a..1c34186 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -5,6 +5,9 @@
  * file "LICENSE" for information on usage and redistribution of this file.
  */
 
+#include <stdbool.h>
+#include <stdlib.h>
+
 /* C language syntactic analyzer */
 int global_var_idx = 0;
 int global_label_idx = 0;