diff -Naur wmmoonclock-1.29.orig/src/xutils.c wmmoonclock-1.29/src/xutils.c
--- wmmoonclock-1.29.orig/src/xutils.c	2017-08-15 00:32:44.000000000 +0200
+++ wmmoonclock-1.29/src/xutils.c	2020-02-27 11:42:33.266076617 +0100
@@ -52,6 +52,13 @@
 XpmIcon		wmgen;
 Pixmap		pixmask;
 
+Display		*display;
+Window          Root;
+Window          iconwin, win;
+int             screen;
+int             DisplayDepth;
+
+
 
 
 
diff -Naur wmmoonclock-1.29.orig/src/xutils.h wmmoonclock-1.29/src/xutils.h
--- wmmoonclock-1.29.orig/src/xutils.h	2017-08-15 00:31:51.000000000 +0200
+++ wmmoonclock-1.29/src/xutils.h	2020-02-27 11:41:58.180058348 +0100
@@ -20,11 +20,11 @@
 /*
  *   Global variable
  */
-Display		*display;
-Window          Root;
-Window          iconwin, win;
-int             screen;
-int             DisplayDepth;
+extern Display		*display;
+extern Window          Root;
+extern Window          iconwin, win;
+extern int             screen;
+extern int             DisplayDepth;