diff -Naur gcc-4.6.2/gcc/config/rs6000/sysv4.h gcc-4.6.2-MTWX51204-dwarf-vector-reg/gcc/config/rs6000/sysv4.h
--- gcc-4.6.2/gcc/config/rs6000/sysv4.h	2011-03-07 01:50:23.000000000 -0600
+++ gcc-4.6.2-MTWX51204-dwarf-vector-reg/gcc/config/rs6000/sysv4.h	2011-12-16 09:44:18.469039002 -0600
@@ -1035,5 +1035,3 @@
 
 /* This target uses the sysv4.opt file.  */
 #define TARGET_USES_SYSV4_OPT 1
-
-#undef DBX_REGISTER_NUMBER