From 7772e660eb216bc38b0b70a7c4d2624d9cf2a99c Mon Sep 17 00:00:00 2001
From: Karl Heuer <kwzh@gnu.org>
Date: Wed, 30 Mar 1994 01:02:01 +0000
Subject: [PATCH] Check for existence of windowing system.

---
 lisp/font-lock.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/font-lock.el b/lisp/font-lock.el
index eedb805c9bb..e2499856f43 100644
--- a/lisp/font-lock.el
+++ b/lisp/font-lock.el
@@ -54,6 +54,9 @@
 
 ;;; Code:
 
+(or window-system
+    (error "Can't fontify on an ASCII terminal"))
+
 (or (internal-find-face 'underline)
     (copy-face 'default 'underline))
 (set-face-underline-p 'underline t)
-- 
2.39.5