This is a slightly modified version of https://svnweb.freebsd.org/ports/head/lang/gcc5/files/patch-libc%2B%2B?revision=432958&view=co&pathrev=432958,
which doesn't apply cleanly due to them using a slightly different format of patch from us. I just replaced the .orig file references with a/b paths.

--- a/gcc/auto-profile.c 2015-01-18 02:25:42 UTC
+++ b/gcc/auto-profile.c
@@ -19,11 +19,9 @@ along with GCC; see the file COPYING3.  
 <http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
-#include "system.h"
-
-#include <string.h>
 #include <map>
 #include <set>
+#include "system.h"
 
 #include "coretypes.h"
 #include "hash-set.h"
--- a/gcc/graphite-isl-ast-to-gimple.c 2017-01-19 21:02:12 UTC
+++ b/gcc/graphite-isl-ast-to-gimple.c
@@ -38,6 +38,7 @@ extern "C" {
 #endif
 #endif
 
+#include <map>
 #include "system.h"
 #include "coretypes.h"
 #include "hash-set.h"
@@ -75,7 +76,6 @@ extern "C" {
 #include "tree-scalar-evolution.h"
 #include "gimple-ssa.h"
 #include "tree-into-ssa.h"
-#include <map>
 
 #ifdef HAVE_isl
 #include "graphite-poly.h"
--- a/gcc/system.h 2015-01-05 12:33:28 UTC
+++ b/gcc/system.h
@@ -217,6 +217,7 @@ extern int errno;
 #ifdef __cplusplus
 # include <algorithm>
 # include <cstring>
+# include <new>
 # include <utility>
 #endif