[gtkglext] Require GTK+ >= 2.20 (for gtk_widget_get_realized).

[Braden McDaniel <bradenmcd src gnome org>]

commit b36f90502179d1ec4450ec85e171d1350dfca7ee
Author: Braden McDaniel <braden endoframe com>
Date:   Mon Apr 26 21:22:32 2010 -0400

    Require GTK+ >= 2.20 (for gtk_widget_get_realized).

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4be9fcd..5ddcf80 100644
--- a/configure.ac
+++ b/configure.ac
@@ -220,9 +220,9 @@ AS_IF([test x$gdktarget = xwin32],
 
 AC_CHECK_HEADERS([inttypes.h stdlib.h string.h])
 
-PKG_CHECK_MODULES([GTK], [gtk+-2.0 >= 2.8], ,
+PKG_CHECK_MODULES([GTK], [gtk+-2.0 >= 2.20], ,
                   [AS_IF([test -z "${GTK_LIBS+x}"],
-                         [AC_MSG_FAILURE([GTK+ 2.8 or newer is required.])])])
+                         [AC_MSG_FAILURE([GTK+ 2.20 or newer is required.])])])
 PKG_CHECK_MODULES([GDK], [gdk-2.0], ,
                   [AS_IF([test -z "${GDK_LIBS+x}"],
                          [AC_MSG_FAILURE([GDK is required.])])])