--- libgig/trunk/configure.ac	2017/07/29 09:57:08	3333
+++ libgig/trunk/configure.ac	2020/07/25 09:28:56	3799
@@ -2,8 +2,8 @@
 # Library's "official" release version:
 
 m4_define(libgig_release_major, 4)
-m4_define(libgig_release_minor, 0)
-m4_define(libgig_release_build, 0.svn30)
+m4_define(libgig_release_minor, 2)
+m4_define(libgig_release_build, 0.svn17)
 
 
 AC_INIT([libgig],[libgig_release_major.libgig_release_minor.libgig_release_build])
@@ -26,7 +26,7 @@
 #  6. If any interfaces have been removed since the last public release, then set age
 #     to 0.
 
-LIBGIG_LT_CURRENT=7
+LIBGIG_LT_CURRENT=9
 LIBGIG_LT_REVISION=0
 LIBGIG_LT_AGE=0
 LIBGIG_SHARED_VERSION_INFO="$LIBGIG_LT_CURRENT:$LIBGIG_LT_REVISION:$LIBGIG_LT_AGE"
@@ -56,6 +56,12 @@
 AC_SUBST(LIBAKAI_RELEASE_MINOR, libakai_release_minor)
 AC_SUBST(LIBAKAI_RELEASE_BUILD, libakai_release_build)
 
+# make sure C++11 is supported by compiler
+# (add CXXFLAGS if required [e.g. -std=c++11])
+m4_ifdef([m4_include(m4/ax_cxx_compile_stdcxx.m4)],,
+             [sinclude([m4/ax_cxx_compile_stdcxx.m4])])
+AX_CXX_COMPILE_STDCXX(11, [], mandatory)
+
 have_audio_file_lib="false"
 
 # check for presence of libsndfile