--- deliantra/server/configure.ac	2012/11/15 05:54:02	1.184
+++ deliantra/server/configure.ac	2016/11/16 22:31:34	1.185
@@ -1,6 +1,7 @@
 dnl Process this file with autoconf to produce a configure script.,
 
-AC_INIT([deliantra-server], [3.0], [support@deliantra.net])
+AC_INIT([deliantra-server], [3.1], [support@deliantra.net])
+dnl AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR(utils)
 AC_CONFIG_SRCDIR([server/cfperl.xs])
 AM_INIT_AUTOMAKE
@@ -90,6 +91,8 @@
 AC_PROG_CXX
 AC_PROG_CPP
 
+AX_CXX_COMPILE_STDCXX_11([noext], [mandatory])
+
 AC_CHECK_HEADER(tr1/unordered_map,[],[AC_MSG_ERROR([Your compiler must support the Library Technical Report 1 extensions.])])
 
 AC_CHECK_HEADER(pthread.h,[],[AC_MSG_ERROR([POSIX thread support is required.])])