--- ./include/__config.orig	2014-01-06 16:23:02.000000000 +0100
+++ ./include/__config	2014-05-06 14:12:18.649712048 +0200
@@ -309,7 +309,7 @@
 #endif
 
 #if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) && _FreeBSD_version >= 901501
 #define _LIBCPP_HAS_QUICK_EXIT
 #define _LIBCPP_HAS_C11_FEATURES
 #elif defined(__linux__)