--- OLD/xc/programs/xrdb/xrdb.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/xrdb/xrdb.c	Thu Jan  1 00:00:00 1970
@@ -47,6 +47,7 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <errno.h>
+#include <stdlib.h>
 
 #ifdef X_NOT_STDC_ENV
 extern int errno;