Backported from later versions

--- gcc-4.2.2/gcc/config.gcc       2007-11-22 16:27:45.000000000 +0000
+++ gcc-4.2.2/gcc/config.gcc       2007-11-22 16:23:00.000000000 +0000
@@ -1033,6 +1033,11 @@
 	tmake_file="i386/t-i386elf t-svr4"
 	use_fixproto=yes
 	;;
+x86_64-*-elf*)
+	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h i386/i386elf.h i386/x86-64.h"
+	tmake_file="i386/t-i386elf t-svr4"
+	use_fixproto=yes
+	;;
 i[34567]86-sequent-ptx4* | i[34567]86-sequent-sysv4*)
 	if test x$gas = xyes
 	then

We don't have a libc yet at this stage. Unused anyway

--- gcc-4.2.2/gcc/unwind-generic.h.orig 2008-01-11 18:54:40.000000000 +0100
+++ gcc-4.2.2/gcc/unwind-generic.h      2008-01-11 18:54:31.000000000 +0100
@@ -203,7 +203,6 @@
    compatible with the standard ABI for IA-64, we inline these.  */
 
 #ifdef __ia64__
-#include <stdlib.h>
 
 static inline _Unwind_Ptr
 _Unwind_GetDataRelBase (struct _Unwind_Context *_C)
Backported from later versions