https://gitlab.com/compiz/compiz-core/-/merge_requests/177

--- compiz-0.8.18/plugins/commands.c.orig
+++ compiz-0.8.18/plugins/commands.c
@@ -23,6 +23,7 @@
  * Author: Danny Baumann <dannybaumann@web.de>
  */
 
+#include <stdlib.h>
 #include <compiz-core.h>
 
 static CompMetadata commandsMetadata;
--- compiz-0.8.18/plugins/cube.c.orig
+++ compiz-0.8.18/plugins/cube.c
@@ -24,6 +24,7 @@
  *         Mirco Müller <macslow@bangang.de> (Skydome support)
  */
 
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 
--- compiz-0.8.18/plugins/matecompat.c.orig
+++ compiz-0.8.18/plugins/matecompat.c
@@ -23,6 +23,7 @@
  * Author: Danny Baumann <dannybaumann@web.de>
  */
 
+#include <stdlib.h>
 #include <compiz-core.h>
 
 static CompMetadata mateMetadata;
--- compiz-0.8.18/plugins/obs.c.orig
+++ compiz-0.8.18/plugins/obs.c
@@ -23,6 +23,7 @@
  * Author: Danny Baumann <dannybaumann@web.de>
  */
 
+#include <stdlib.h>
 #include <compiz-core.h>
 
 static CompMetadata obsMetadata;
--- compiz-0.8.18/src/core.c.orig
+++ compiz-0.8.18/src/core.c
@@ -23,6 +23,7 @@
  * Author: David Reveman <davidr@novell.com>
  */
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <compiz-core.h>
--- compiz-0.8.18/src/metadata.c.orig
+++ compiz-0.8.18/src/metadata.c
@@ -25,6 +25,7 @@
  *          David Reveman <davidr@novell.com>
  */
 
+#include <stdlib.h>
 #include <string.h>
 #include <libxml/tree.h>
 #include <libxml/xpath.h>