--- libgig/trunk/configure.ac	2019/10/01 16:41:06	3622
+++ libgig/trunk/configure.ac	2019/10/02 16:30:29	3623
@@ -3,7 +3,7 @@
 
 m4_define(libgig_release_major, 4)
 m4_define(libgig_release_minor, 2)
-m4_define(libgig_release_build, 0)
+m4_define(libgig_release_build, 0.svn1)
 
 
 AC_INIT([libgig],[libgig_release_major.libgig_release_minor.libgig_release_build])
@@ -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