diff -Naur wmcms-0.3.5.orig/wmcms.c wmcms-0.3.5/wmcms.c
--- wmcms-0.3.5.orig/wmcms.c	2001-09-24 00:57:06.000000000 +0200
+++ wmcms-0.3.5/wmcms.c	2020-03-29 13:04:56.465162877 +0200
@@ -28,6 +28,7 @@
 GC gc;
 Pixmap pixmap;
 Pixmap backdrop;
+Display *display;
 
 int advanced;
 int up;