diff -Naur wmdots.orig/wmdots/wmdots.c wmdots/wmdots/wmdots.c
--- wmdots.orig/wmdots/wmdots.c	1999-10-11 21:39:11.000000000 +0200
+++ wmdots/wmdots/wmdots.c	2020-03-01 16:08:39.492275206 +0100
@@ -315,6 +315,9 @@
 //   10,30,&y_off,-5,30,10
 // };
 
+Display		*display;
+Window          Root, iconwin, win;
+
 // -----------------------------------------------------------------------
 // draw a point at x/y in specified colour
 
diff -Naur wmdots.orig/wmgeneral/wmgeneral.h wmdots/wmgeneral/wmgeneral.h
--- wmdots.orig/wmgeneral/wmgeneral.h	1998-10-16 02:16:59.000000000 +0200
+++ wmdots/wmgeneral/wmgeneral.h	2020-03-01 16:08:45.412276631 +0100
@@ -36,8 +36,8 @@
  /* Global variable */
 /*******************/
 
-Display		*display;
-Window          Root, iconwin, win;
+extern Display		*display;
+extern Window          Root, iconwin, win;
 
 
   /***********************/