diff -Naur wmGrabImage-0.72.orig/wmgeneral/wmgeneral.c wmGrabImage-0.72/wmgeneral/wmgeneral.c
--- wmGrabImage-0.72.orig/wmgeneral/wmgeneral.c	2001-05-27 21:02:18.000000000 +0200
+++ wmGrabImage-0.72/wmgeneral/wmgeneral.c	2020-02-02 12:25:53.013879815 +0100
@@ -47,6 +47,10 @@
 char		*Geometry = "";
 Window		iconwin, win;
 Pixmap		pixmask;
+Display		*display;
+Window		Root;
+GC			NormalGC;
+XpmIcon		wmgen;
 
   /*****************/
  /* Mouse Regions */
diff -Naur wmGrabImage-0.72.orig/wmgeneral/wmgeneral.h wmGrabImage-0.72/wmgeneral/wmgeneral.h
--- wmGrabImage-0.72.orig/wmgeneral/wmgeneral.h	2001-05-27 21:02:18.000000000 +0200
+++ wmGrabImage-0.72/wmgeneral/wmgeneral.h	2020-02-02 12:25:31.926869125 +0100
@@ -28,10 +28,10 @@
  /* Global variable */
 /*******************/
 
-Display		*display;
-Window          Root;
-GC              NormalGC;
-XpmIcon         wmgen;
+extern Display  *display;
+extern Window   Root;
+extern GC       NormalGC;
+extern XpmIcon  wmgen;
 
 
   /***********************/