This will fail bad with sandbox.

--- gcc/Makefile.in
+++ gcc/Makefile.in
@@ -2179,13 +2179,6 @@
 # exists.
 # We deliberately use tooldir instead of gcc_tooldir here.  gcc_tooldir
 # won't work because libsubdir doesn't exist yet.
-	if [ "$(SYSTEM_HEADER_DIR)" = "$(tooldir)/sys-include" ] \
-	   && [ -d $(tooldir)/sys-include ]; then \
-	  if [ -d $(libdir) ] ; then true ; else mkdir $(libdir) ; fi; \
-	  if [ -d $(libdir)/gcc-lib ] ; then true ; else mkdir $(libdir)/gcc-lib; fi; \
-	  if [ -d $(libdir)/gcc-lib/$(target_alias) ] ; then true ; else mkdir $(libdir)/gcc-lib/$(target_alias) ; fi; \
-	  if [ -d $(libdir)/gcc-lib/$(target_alias)/$(version) ] ; then true ; else mkdir $(libdir)/gcc-lib/$(target_alias)/$(version) ; fi; \
-	else true; fi
 
 	touch stmp-fixinc