--- asterisk-1.4.11/Makefile.rules.orig	2007-09-22 14:18:39.308683093 -0400
+++ asterisk-1.4.11/Makefile.rules	2007-09-22 14:19:00.370469987 -0400
@@ -30,7 +30,7 @@
 # Uncomment to enable MMXTM optimizations for x86 architecture CPU's
 # which support MMX instructions.  This should be newer pentiums,
 # ppro's, etc, as well as the AMD K6 and K7.  
-#K6OPT=-DK6OPT
+K6OPT=-DK6OPT
 
 OPTIMIZE?=-O6
 ASTCFLAGS+=$(OPTIMIZE)