diff -ruN libcroco-0.6.12-orig/csslint/csslint.c libcroco-0.6.12/csslint/csslint.c
--- libcroco-0.6.12-orig/csslint/csslint.c	2015-12-13 12:23:40.000000000 -0600
+++ libcroco-0.6.12/csslint/csslint.c	2024-03-14 04:59:33.000000000 -0500
@@ -28,6 +28,7 @@
 
 #include <glib.h>
 #include <string.h>
+#include <stdlib.h>
 
 /**
  *The options data structure.