[clutter-gtk] configure.ac: bump gtk+ dependency

[Lionel Landwerlin <llandwerlin src gnome org>]

commit e350c4994b6e49bdfeb8151fa42f2848de0cb6e2
Author: Lionel Landwerlin <lionel g landwerlin intel com>
Date:   Thu Dec 10 12:15:27 2015 +0000

    configure.ac: bump gtk+ dependency
    
    We depend on a behavior change in GdkOffscreenWindow for HiDpi
    displays.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 034a6ba..50725bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,7 +83,7 @@ AC_CHECK_LIBM
 AC_SUBST(LIBM)
 
 m4_define([clutter_req_version], [1.23.7])
-m4_define([gtk_req_version], [3.8.0])
+m4_define([gtk_req_version], [3.19.4])
 
 PKG_CHECK_MODULES([CLUTTER_GTK_DEPS], [clutter-1.0 >= clutter_req_version gtk+-3.0 >= gtk_req_version])
 AC_SUBST([CLUTTER_GTK_DEPS_CFLAGS])