[gtksourceviewmm] Use glibmm-2.56 instead of glibmm-2.54

[Murray Cumming <murrayc src gnome org>]

commit 739ac7308dc43b2fedab803497a72165ed4fdd2b
Author: Murray Cumming <murrayc murrayc com>
Date:   Sun Jan 14 20:54:57 2018 +0100

    Use glibmm-2.56 instead of glibmm-2.54
    
    We changed the glibmm ABI name a while ago.

 codegen/Makefile.am |    2 +-
 configure.ac        |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/codegen/Makefile.am b/codegen/Makefile.am
index 3639738..4afe661 100644
--- a/codegen/Makefile.am
+++ b/codegen/Makefile.am
@@ -6,7 +6,7 @@ dist_noinst_DATA = $(addprefix m4/,$(files_codegen_m4))
 noinst_PROGRAMS = extradefs/generate_extra_defs
 
 extradefs_generate_extra_defs_SOURCES = extradefs/generate_extra_defs_gtksourceview.cc
-extradefs_generate_extra_defs_LDADD   = $(GTKSOURCEVIEWMM_LIBS) -lglibmm_generate_extra_defs-2.54
+extradefs_generate_extra_defs_LDADD   = $(GTKSOURCEVIEWMM_LIBS) -lglibmm_generate_extra_defs-2.56
 
 AM_CPPFLAGS = -I$(top_builddir) $(GTHREAD_CFLAGS) $(GTKSOURCEVIEWMM_CFLAGS)
 AM_CXXFLAGS = $(GTKSOURCEVIEWMM_WXXFLAGS)
diff --git a/configure.ac b/configure.ac
index de126bd..32939fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ AC_SUBST([GTKSOURCEVIEWMM_MODULES], ['gtkmm-4.0 >= 3.18.0 gtksourceview-4 >= 3.9
 PKG_CHECK_MODULES([GTKSOURCEVIEWMM], [$GTKSOURCEVIEWMM_MODULES])
 
 MM_PKG_CONFIG_SUBST([GTHREAD_CFLAGS], [--cflags-only-other gthread-2.0])
-MM_PKG_CONFIG_SUBST([GMMPROC_DIR], [--variable=gmmprocdir glibmm-2.54])
+MM_PKG_CONFIG_SUBST([GMMPROC_DIR], [--variable=gmmprocdir glibmm-2.56])
 MM_PKG_CONFIG_SUBST([GMMPROC_EXTRA_M4_DIR], [--variable=gmmprocm4dir pangomm-2.42 atkmm-2.26 gtkmm-4.0])
 
 MM_ARG_DISABLE_DEPRECATED_API([GTKSOURCEVIEWMM])
@@ -39,7 +39,7 @@ MM_ARG_DISABLE_DEPRECATED_API([GTKSOURCEVIEWMM])
 MM_ARG_ENABLE_DOCUMENTATION
 MM_ARG_WITH_TAGFILE_DOC([libstdc++.tag], [mm-common-libstdc++])
 MM_ARG_WITH_TAGFILE_DOC([libsigc++-3.0.tag], [sigc++-3.0])
-MM_ARG_WITH_TAGFILE_DOC([glibmm-2.54.tag], [glibmm-2.54])
+MM_ARG_WITH_TAGFILE_DOC([glibmm-2.56.tag], [glibmm-2.56])
 MM_ARG_WITH_TAGFILE_DOC([cairomm-1.14.tag], [cairomm-1.14])
 MM_ARG_WITH_TAGFILE_DOC([pangomm-2.42.tag], [pangomm-2.42])
 MM_ARG_WITH_TAGFILE_DOC([gtkmm-4.0.tag], [gtkmm-4.0])