[gnome-calculator] Bump GTK requirement

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5f1f8d14930308ba00a7c84841b674e195f6746e
Author: Yosef Or Boczko <yoseforb gmail com>
Date:   Mon Nov 25 13:01:56 2013 +0200

    Bump GTK requirement
    
    It requires for close button and for
    fallback app menu in a headerbar.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=705909

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9a24fcf..32436d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ dnl ###########################################################################
 
 GLIB_REQUIRED=2.31
 GIO_REQUIRED=2.25.10
-GTK_REQUIRED=3.0
+GTK_REQUIRED=3.11.2
 GTKSOURCEVIEW_REQUIRED=3.0.0
 
 PKG_CHECK_MODULES(GNOME_CALCULATOR, [