From 3b4897c833dc8ae423034bfe09a83ab71b6a9edb Mon Sep 17 00:00:00 2001
From: Roland Lutz <rlutz@hedmen.org>
Date: Mon, 2 Mar 2015 18:54:06 +0100
Subject: [PATCH] Add check for GL/GLU library

Requested by yugami:
> might I suggest explicitly including libGL as well as libpng.
> One of the previous builders errors needed that explicitly added in
---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/configure.ac b/configure.ac
index d323c1e..14943e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -102,6 +102,20 @@ AC_CHECK_HEADERS(
         [png.h], [],
         [AC_MSG_ERROR([Cannot find png.h])])
 
+AC_CHECK_LIB(
+        [GL], [glVertex2d], [],
+        [AC_MSG_ERROR([Cannot find -lGL])])
+AC_CHECK_HEADERS(
+        [GL/gl.h], [],
+        [AC_MSG_ERROR([Cannot find GL/gl.h])])
+
+AC_CHECK_LIB(
+        [GLU], [gluTessVertex], [],
+        [AC_MSG_ERROR([Cannot find -lGLU])])
+AC_CHECK_HEADERS(
+        [GL/glu.h], [],
+        [AC_MSG_ERROR([Cannot find GL/glu.h])])
+
 ##
 ## FLTK
 ##