Index: head/contrib/gcc/cppdefault.c
===================================================================
--- head/contrib/gcc/cppdefault.c
+++ head/contrib/gcc/cppdefault.c
@@ -48,7 +48,7 @@
 = {
 #ifdef GPLUSPLUS_INCLUDE_DIR
     /* Pick up GNU C++ generic include files.  */
-    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, 0, 0 },
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, 1, 0 },
 #endif
 #ifdef GPLUSPLUS_TOOL_INCLUDE_DIR
     /* Pick up GNU C++ target-dependent include files.  */
@@ -56,7 +56,7 @@
 #endif
 #ifdef GPLUSPLUS_BACKWARD_INCLUDE_DIR
     /* Pick up GNU C++ backward and deprecated include files.  */
-    { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, 0, 0 },
+    { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, 1, 0 },
 #endif
 #ifdef LOCAL_INCLUDE_DIR
     /* /usr/local/include comes before the fixincluded header files.  */
Index: head/gnu/usr.bin/cc/Makefile.inc
===================================================================
--- head/gnu/usr.bin/cc/Makefile.inc
+++ head/gnu/usr.bin/cc/Makefile.inc
@@ -25,6 +25,7 @@
 
 .if ${TARGET_ARCH} != ${MACHINE_ARCH}
 CFLAGS+=	-DCROSS_DIRECTORY_STRUCTURE
+CFLAGS+=	-DTARGET_SYSTEM_ROOT=\"${TOOLS_PREFIX}\"
 .endif
 
 .if ${TARGET_CPUARCH} == "arm"
Index: head/gnu/usr.bin/cc/cc_tools/freebsd-native.h
===================================================================
--- head/gnu/usr.bin/cc/cc_tools/freebsd-native.h
+++ head/gnu/usr.bin/cc/cc_tools/freebsd-native.h
@@ -15,14 +15,10 @@
 #undef LOCAL_INCLUDE_DIR		/* We don't wish to support one. */
 
 /* Look for the include files in the system-defined places.  */
-#define GPLUSPLUS_INCLUDE_DIR		PREFIX"/include/c++/"GCCVER
-#define	GPLUSPLUS_BACKWARD_INCLUDE_DIR	PREFIX"/include/c++/"GCCVER"/backward"
+#define GPLUSPLUS_INCLUDE_DIR		"/usr/include/c++/"GCCVER
+#define	GPLUSPLUS_BACKWARD_INCLUDE_DIR	"/usr/include/c++/"GCCVER"/backward"
 #define GCC_INCLUDE_DIR			PREFIX"/include/gcc/"GCCVER
-#ifdef CROSS_DIRECTORY_STRUCTURE
-#define CROSS_INCLUDE_DIR		PREFIX"/include"
-#else
-#define STANDARD_INCLUDE_DIR		PREFIX"/include"
-#endif
+#define STANDARD_INCLUDE_DIR		"/usr/include"
 
 /* Under FreeBSD, the normal location of the compiler back ends is the
    /usr/libexec directory.