commit 5358a48008237a4a83054e3b0fcb1005bf2dfcd5
Author: Hubert Figuière <hub figuiere net>
Date:   Tue Nov 1 22:26:51 2016 -0400

    Bump Gtkmm version to 3.18
    
    - Also require glibmm 2.46
    - And C++11.

diff --git a/configure.ac b/configure.ac
index dcce168..dbee7cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,21 +36,21 @@ dnl First, Here goes the list of the version of the librairies
 dnl we depend on. Some variables are AC_SUBSTed so that they can be used in the
 dnl .pc files as well
 dnl ************************************************************
-LIBGMODULE_VERSION=2.14
+LIBGMODULE_VERSION=2.46
 AC_SUBST([LIBGMODULE_VERSION])
-LIBGTHREAD_VERSION=2.14
+LIBGTHREAD_VERSION=2.46
 AC_SUBST([LIBGTHREAD_VERSION])
-LIBGLIBMM_VERSION=2.14
+LIBGLIBMM_VERSION=2.46
 AC_SUBST([LIBGLIBMM_VERSION])
 LIBXML2_VERSION=2.6.22
 AC_SUBST([LIBXML2_VERSION])
-LIBGTK_VERSION=2.22
+LIBGTK_VERSION=3.18
 AC_SUBST([LIBGTK_VERSION])
-LIBGTKMM_VERSION=3.0
+LIBGTKMM_VERSION=3.18
 AC_SUBST([LIBGTKMM_VERSION])
 LIBGTKSOURCEVIEWMM_VERSION=3.0
 AC_SUBST([LIBGTKSOURCEVIEWMM_VERSION])
-LIBGIOMM_VERSION=2.15.2
+LIBGIOMM_VERSION=2.46
 AC_SUBST([LIBGIOMM_VERSION])
 SQLITE3_VERSION=3.0
 AC_SUBST([SQLITE3_VERSION])
@@ -270,10 +270,9 @@ if test x$GLIBMM_USES_DEPRECATED_GLIB_FUNCS = xyes; then
    AC_MSG_NOTICE(glibmm uses deprecated glib functions!)
 fi
 
-dnl detect if c++11 is required, because of glibmm-24 >= 2.46
-PKG_CHECK_EXISTS([glibmm-2.4 >= 2.46],
-                 [CXX11_IS_REQUIRED=yes],
-		 [CXX11_IS_REQUIRED=no])
+dnl c++11 is required, because of glibmm-24 >= 2.46
+dnl TODO actually check the compiler for it.
+CXX11_IS_REQUIRED=yes
 
 dnl Check for pty.h and its alternatives
 dnl https://www.gnu.org/software/gnulib/manual/html_node/pty_002eh.html