diff -ruN qemu.ORIG/Makefile.target qemu/Makefile.target
--- qemu.ORIG/Makefile.target	2008-05-04 10:42:56.000000000 -0400
+++ qemu/Makefile.target	2008-05-04 12:02:56.068374000 -0400
@@ -96,6 +96,7 @@
 ifeq ($(ARCH),i386)
 HELPER_CFLAGS+=-fomit-frame-pointer
 OP_CFLAGS+=-mpreferred-stack-boundary=2 -fomit-frame-pointer
+MTUNE_CFLAGS=-march=i486 -mtune=i686
 endif
 
 ifeq ($(ARCH),ppc)
@@ -279,6 +280,12 @@
 LIBOBJS+=s390-dis.o
 endif
 
+ifeq ($(ARCH), i386)
+	HCFLAGS=`echo $(CFLAGS) | sed 's,-march=i686,,'`
+else
+	HCFLAGS=$(CFLAGS)
+endif
+
 # libqemu
 
 ifndef CONFIG_NO_DYNGEN_OP
@@ -309,7 +316,7 @@
 	$(DYNGEN) -g -o $@ $<
 
 op.o: op.c
-	$(CC) $(OP_CFLAGS) $(CPPFLAGS) -c -o $@ $<
+	$(CC) $(OP_CFLAGS) $(CPPFLAGS) $(MTUNE_CFLAGS) -c -o $@ $<
 
 machine.o: machine.c
 	$(CC) $(OP_CFLAGS) $(CPPFLAGS) -c -o $@ $<
@@ -319,7 +326,7 @@
 ifeq ($(TARGET_BASE_ARCH), i386)
 # XXX: rename helper.c to op_helper.c
 helper.o: helper.c
-	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
+	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) $(MTUNE_CFLAGS) $(HCFLAGS) -c -o $@ $<
 else
 op_helper.o: op_helper.c
 	$(CC) $(HELPER_CFLAGS) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<