--- asterisk-1.4.26.2/Makefile.rules.orig	2009-09-09 15:52:34.063291569 -0430
+++ asterisk-1.4.26.2/Makefile.rules	2009-09-09 15:52:46.814961322 -0430
@@ -42,7 +42,7 @@
     # 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
 
     ASTCFLAGS+=$(OPTIMIZE)
 endif