diff -uNrp old/operations/common/matting-global.c new/operations/common/matting-global.c
--- old/operations/common/matting-global.c	2012-04-02 23:15:26.000000000 +0200
+++ new/operations/common/matting-global.c	2016-12-04 11:10:25.255103750 +0100
@@ -19,6 +19,7 @@
 #include "config.h"
 #include <glib/gi18n-lib.h>
 #include <math.h>
+#include <stdlib.h>
 
 #ifdef GEGL_CHANT_PROPERTIES