http://bugs.gentoo.org/219754

--- src/main.c
+++ src/main.c
@@ -1853,15 +1853,13 @@
   //get_options(argc, argv);
   //display_options();
 
-	if (display_name == NULL)
-		if ((display_name = getenv("DISPLAY")) == NULL)
-			display_name = ":0";
-
 	Xdisplay = XOpenDisplay(display_name);
 
 	if (!Xdisplay)
 	{
-		print_error("can't open display %s", display_name);
+		print_error("can't open display %s", display_name?display_name:
+				getenv("DISPLAY")?getenv("DISPLAY"):
+				"as no -d given and DISPLAY not set");
 		exit(EXIT_FAILURE);
 	}