To get an OpenGL core profile context freeglut 2.6 or later is required.

Note that in spite of it's name HAVE_FREEGLUT is only defined if freeglut 2.6
(released in 2009) or later ist found.

Signed-off-by: Fabian Bieler <fabianbie...@fastmail.fm>
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index 0c38f4d..cd523c1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,6 +83,12 @@ AC_CHECK_LIB([glut],
                [],
                [glut_enabled=no])
 
+dnl Check for FreeGLUT 2.6 or later
+AC_EGREP_HEADER([glutInitContextProfile],
+               [GL/freeglut.h],
+               [AC_DEFINE(HAVE_FREEGLUT)],
+               [])
+
 dnl Check for GLEW
 PKG_CHECK_MODULES(GLEW, [glew >= 1.5.4])
 DEMO_CFLAGS="$DEMO_CFLAGS $GLEW_CFLAGS"
-- 
1.8.3.2

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