Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.0/gentoo/66_all_gcc43-pr25343.patch
http://gcc.gnu.org/PR25343

sniped from Debian

2008-04-27  Roman Zippel <zippel@linux-m68k.org>

	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Define for __mc68000__.

diff -durN gcc-4.3.0.orig/gcc/config/host-linux.c gcc-4.3.0/gcc/config/host-linux.c
--- gcc-4.3.0.orig/gcc/config/host-linux.c	2007-08-02 12:49:31.000000000 +0200
+++ gcc-4.3.0/gcc/config/host-linux.c	2008-06-10 14:45:20.000000000 +0200
@@ -84,6 +84,8 @@
 # define TRY_EMPTY_VM_SPACE	0x8000000000
 #elif defined(__sparc__)
 # define TRY_EMPTY_VM_SPACE	0x60000000
+#elif defined(__mc68000__)
+# define TRY_EMPTY_VM_SPACE	0x40000000
 #else
 # define TRY_EMPTY_VM_SPACE	0
 #endif
