[gtkglext] Acknowledge HAVE_CONFIG_H.

[Ralf Corsépius <rcorsepius src gnome org>]

commit bf1057ab3382bb9be149a1be2c232a6694e52266
Author: Ralf Corsepius <rcorsepius src gnome org>
Date:   Sat Dec 26 16:52:49 2009 +0100

    Acknowledge HAVE_CONFIG_H.

 gtk/gtkglinit.c    |    4 ++++
 gtk/gtkglversion.c |    4 ++++
 gtk/gtkglwidget.c  |    4 ++++
 3 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkglinit.c b/gtk/gtkglinit.c
index 05117ee..99bbcaa 100644
--- a/gtk/gtkglinit.c
+++ b/gtk/gtkglinit.c
@@ -16,6 +16,10 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
 #include <string.h>
 #include <stdlib.h>
 
diff --git a/gtk/gtkglversion.c b/gtk/gtkglversion.c
index 8fa23c1..8b5c599 100644
--- a/gtk/gtkglversion.c
+++ b/gtk/gtkglversion.c
@@ -16,6 +16,10 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
 #include "gtkglversion.h"
 
 const guint gtkglext_major_version = GTKGLEXT_MAJOR_VERSION;
diff --git a/gtk/gtkglwidget.c b/gtk/gtkglwidget.c
index 933e1a6..76a93d6 100644
--- a/gtk/gtkglwidget.c
+++ b/gtk/gtkglwidget.c
@@ -16,6 +16,10 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
 #include "gtkglprivate.h"
 #include "gtkglwidget.h"