C++ 2011 is no longer optional

diff --git a/configure.ac b/configure.ac
index 21ddf1230e10e130d038ca689430a0b871d462c5..5054cae57e44f190e93bb9f080fed9ab06d3fdb7 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -50,7 +50,7 @@ AS_IF([test "x$with_luajit" = "xno"], [
   PDNS_WITH_LUA
 ])
 
-AX_CXX_COMPILE_STDCXX_11(,optional)
+AX_CXX_COMPILE_STDCXX_11()
 AM_CONDITIONAL([CXX2011],[test "$HAVE_CXX11" = "1"])
 
 AC_MSG_CHECKING([whether we will enable compiler security checks])