--- OLD/xc/programs/xfs/os/error.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/xfs/os/error.c	Thu Jan  1 00:00:00 1970
@@ -42,6 +42,7 @@
  */
 
 #include	<stdio.h>
+#include <stdlib.h>
 #include	<X11/Xos.h>
 #ifndef X_NOT_POSIX
 #ifdef _POSIX_SOURCE