From b12b3425e18b82f61413eef172f42c522a791850 Mon Sep 17 00:00:00 2001
From: Thomas Goyne <plorkyeran@aegisub.org>
Date: Thu, 22 Dec 2011 21:20:07 +0000
Subject: [PATCH] Check for missing OpenGL by inspecting $gl_no rather than
 GL_LIBS, which could theoretically be empty

Originally committed to SVN as r6068.
---
 aegisub/configure.in | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/aegisub/configure.in b/aegisub/configure.in
index e220a0014..6cdf71277 100644
--- a/aegisub/configure.in
+++ b/aegisub/configure.in
@@ -350,9 +350,11 @@ AC_CHECK_SIZEOF([time_t])
 ## OpenGL
 #########
 AX_CHECK_GL
-if test -z "$GL_LIBS"; then
-	AC_MSG_FAILURE([aegisub requires GL support.])
+
+if test "$no_gl" = "yes"; then
+    AC_MSG_FAILURE([Aegisub requires GL support.])
 fi
+
 AC_SUBST(GL_CFLAGS)
 AC_SUBST(GL_LIBS)