Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 25569)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 25570)
@@ -2474,10 +2474,10 @@
 	dnl other options
 	dnl optimization{{{
-	dnl -- bypass standard optimization -g -O2 -fPIC ?
+	dnl -- bypass standard optimization -g -O2 -fPIC -std=c++11?
 	AC_ARG_WITH(
 		[cxxoptflags],
-		AS_HELP_STRING([--with-cxxoptflags=CXXOPTFLAGS], [C++ optimization flags (i.e. --with-cxxoptflags="-march=opteron -O3"]),
+		AS_HELP_STRING([--with-cxxoptflags=CXXOPTFLAGS], [C++ optimization flags (i.e. --with-cxxoptflags="-march=opteron -O3 -std=c++11 "]),
 		[CXXOPTFLAGS=${withval}],
-		[CXXOPTFLAGS="-g -O2 -fPIC"]
+		[CXXOPTFLAGS="-g -O2 -fPIC -std=c++11"]
 	)
 	AC_MSG_CHECKING(for C++ optimization flags)