From 0c7a2ee97ee862fd9d50b0aabab3cf97425d7daf Mon Sep 17 00:00:00 2001
From: John Hawthorn <john.hawthorn@gmail.com>
Date: Sat, 28 Dec 2013 15:28:53 -0800
Subject: proper error message on missing X display

assert is inappropriate here because it is optimized out when compiling
with NDEBUG
---
 src/xlib.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/xlib.c b/src/xlib.c
index 2912321..ebc3a4c 100644
--- a/src/xlib.c
+++ b/src/xlib.c
@@ -172,8 +172,11 @@ static int xquit(Display *d){
 }
 
 void backend_init(){
-	display = XOpenDisplay (NULL);
-	assert(display);
+	display = XOpenDisplay(NULL);
+	if(!display){
+		fprintf(stderr, "Can't open X display.\n");
+		exit(EXIT_FAILURE);
+	}
 	xfd = ConnectionNumber(display);
 	screen = DefaultScreen(display);
 
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