$NetBSD: patch-config.h.in,v 1.1 2015/01/10 18:13:22 rumko Exp $

Fix build under fbsd, do not use tr1 with libc++.

--- config.h.in.orig	2014-11-15 18:11:36.000000000 +0000
+++ config.h.in
@@ -353,7 +353,8 @@ char * strerror(int n);
 
 // TR1 regex not supported in GCC <= 4.5
 #ifndef LYX_USE_TR1
-#  if __GNUC__ == 4 
+#  include <ciso646>
+#  if __GNUC__ == 4 && !defined(_LIBCPP_VERSION)
 #    define LYX_USE_TR1
 #  endif
 #endif