--- a/make-rules/shared-macros.mk	Fri Feb 25 09:53:34 2011 -0800
+++ b/make-rules/shared-macros.mk	Fri Feb 25 10:07:58 2011 -0800
@@ -241,7 +241,7 @@
 studio_XBITS.sparc.32 =	-xtarget=ultra2 -xarch=sparcvis -xchip=ultra2
 studio_XBITS.sparc.64 =	-xtarget=ultra2 -xarch=sparcvis -xchip=ultra2
 studio_XBITS.i386.32 =	-xchip=pentium
-studio_XBITS.i386.64 =	-xarch=generic64 -Ui386 -U__i386
+studio_XBITS.i386.64 =	-xchip=generic -Ui386 -U__i386
 studio_XBITS = $(studio_XBITS.$(MACH).$(BITS))
 
 # Turn on recognition of supported C99 language features and enable the 1999 C