--- gigedit/trunk/configure.ac	2019/08/24 13:42:17	3566
+++ gigedit/trunk/configure.ac	2019/10/01 16:21:28	3619
@@ -5,7 +5,7 @@
 
 m4_define(gigedit_ver_major, 1)
 m4_define(gigedit_ver_minor, 1)
-m4_define(gigedit_ver_release, 1.svn1)
+m4_define(gigedit_ver_release, 1.svn2)
 
 AC_INIT([gigedit], [gigedit_ver_major.gigedit_ver_minor.gigedit_ver_release])
 AC_CONFIG_SRCDIR([configure.ac])
@@ -70,6 +70,12 @@
 AM_CONDITIONAL(WINDOWS, test "$windows" = "yes")
 AM_CONDITIONAL(MAC, test "$mac" = "yes")
 
+# 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)
+
 # Note: even though Objective-C sources are just compiled for Mac, the
 # following AC macros though must not be embedded into a shell check
 # (if test "$mac" = "yes" ...), because those AC macros themselves are