[clutter-gtkmm] Use C++11

[Murray Cumming <murrayc src gnome org>]

commit 75fdd46e064b6258dc1c37de951fc99952fd5f85
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Feb 24 20:37:33 2016 +0100

    Use C++11
    
    Mostly so we can build against the latest gtkmm.

 configure.ac |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7d1e954..90d4982 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,13 +30,15 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
 AM_MAINTAINER_MODE
 AC_ARG_VAR([ACLOCAL_FLAGS], [aclocal flags, e.g. -I <macro dir>])
 
-MM_PREREQ([0.8])
+MM_PREREQ([0.9.10])
 MM_INIT_MODULE([clutter-gtkmm-1.0])
 
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
 AC_SUBST([CLUTTER_GTKMM_SO_VERSION], [2:0:0])
 
 AC_PROG_CXX
+MM_AX_CXX_COMPILE_STDCXX([11], [noext],[mandatory])
+
 AC_DISABLE_STATIC
 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL