[pangomm] Use the glibmm-2.52 ABI instead of glibmm-2.4

[Murray Cumming <murrayc src gnome org>]

commit 8ee1599bcb49e4abfd84a7997e344a32fe18d8c3
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Nov 11 10:52:24 2016 +0100

    Use the glibmm-2.52 ABI instead of glibmm-2.4

 configure.ac         |    8 ++++----
 pango/src/fontset.hg |    2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 225a578..4146f6e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -49,17 +49,17 @@ MM_AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])
 
-AC_SUBST([PANGOMM_MODULES], ['glibmm-2.4 >= 2.48.0 cairomm-1.0 >= 1.2.2 pangocairo >= 1.38.0'])
+AC_SUBST([PANGOMM_MODULES], ['glibmm-2.52 >= 2.48.0 cairomm-1.0 >= 1.2.2 pangocairo >= 1.38.0'])
 PKG_CHECK_MODULES([PANGOMM], [$PANGOMM_MODULES])
 
 MM_PKG_CONFIG_SUBST([GTHREAD_CFLAGS], [--cflags-only-other gthread-2.0])
-MM_PKG_CONFIG_SUBST([GMMPROC_DIR], [--variable=gmmprocdir glibmm-2.4])
+MM_PKG_CONFIG_SUBST([GMMPROC_DIR], [--variable=gmmprocdir glibmm-2.52])
 
 MM_ARG_DISABLE_DEPRECATED_API
 MM_ARG_ENABLE_DOCUMENTATION
 MM_ARG_WITH_TAGFILE_DOC([libstdc++.tag], [mm-common-libstdc++])
-MM_ARG_WITH_TAGFILE_DOC([libsigc++-2.0.tag], [sigc++-2.0])
-MM_ARG_WITH_TAGFILE_DOC([glibmm-2.4.tag], [glibmm-2.4])
+MM_ARG_WITH_TAGFILE_DOC([libsigc++-3.0.tag], [sigc++-3.0])
+MM_ARG_WITH_TAGFILE_DOC([glibmm-2.52.tag], [glibmm-2.52])
 MM_ARG_WITH_TAGFILE_DOC([cairomm-1.0.tag], [cairomm-1.0])
 
 AC_LANG([C++])
diff --git a/pango/src/fontset.hg b/pango/src/fontset.hg
index aa0d9b9..73e5a39 100644
--- a/pango/src/fontset.hg
+++ b/pango/src/fontset.hg
@@ -44,7 +44,7 @@ public:
   /** For instance,
    * bool on_foreach(const Glib::RefPtr<Pango::Font>& font);
    */
-  typedef sigc::slot< bool, const Glib::RefPtr<Font>& > ForeachSlot;
+  typedef sigc::slot<bool(const Glib::RefPtr<Font>&)> ForeachSlot;
 
   /** Iterates through all the fonts in a fontset, calling @a slot for
    * each one. If @a slot returns true, that stops the iteration.