Index: gcc-4.2.4/gcc/cppdefault.c
===================================================================
--- gcc-4.2.4.orig/gcc/cppdefault.c	2008-10-04 00:07:13.161548578 +0200
+++ gcc-4.2.4/gcc/cppdefault.c	2008-10-04 00:07:32.548205652 +0200
@@ -39,6 +39,7 @@
 # undef STANDARD_INCLUDE_DIR
 #else
 # undef CROSS_INCLUDE_DIR
+# undef STANDARD_INCLUDE_DIR
 #endif
 
 const struct default_include cpp_include_defaults[]