From 1b7f2bff76251d938605450b05de5664953fa1d7 Mon Sep 17 00:00:00 2001
From: "Ben \"root\" Anderson" <roothorick@gmail.com>
Date: Fri, 25 Oct 2013 01:47:06 -0500
Subject: [PATCH] Lacking X11 should be an error on non-Win32 as X11 then is
 our only LowLevelWindow option.

---
 autoconf/m4/x11.m4 | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/autoconf/m4/x11.m4 b/autoconf/m4/x11.m4
index b8999fbbe6..2ce84924f6 100644
--- a/autoconf/m4/x11.m4
+++ b/autoconf/m4/x11.m4
@@ -46,9 +46,11 @@ AC_DEFUN([SM_X11],
 	fi
 
 	if test "$have_xrandr" = "no"; then
-		echo "*** Direct X11 support needs Xrandr libraries and headers."
-		echo "*** Couldn't find needed headers. Continuing without X11 backend."
-		no_x=yes
+		if test "$unix" = "yes"; then
+			AC_MSG_ERROR("Couldn't find X11 libraries.")
+		else
+			no_x=yes
+		fi
 	else
 		XLIBS="$XLIBS -lXrandr"
 	fi