--- /dev/null
+http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25672
+
+--- Makefile.in.orig Thu Dec 15 19:02:02 2005
++++ Makefile.in Thu Apr 27 03:58:59 2006
+@@ -329,7 +329,7 @@
+ # CFLAGS will be just -g. We want to ensure that TARGET libraries
+ # (which we know are built with gcc) are built with optimizations so
+ # prepend -O2 when setting CFLAGS_FOR_TARGET.
+-CFLAGS_FOR_TARGET = -O2 $(CFLAGS) $(SYSROOT_CFLAGS_FOR_TARGET)
++CFLAGS_FOR_TARGET = -O2 $(filter-out -march=% -mcpu=%,$(CFLAGS)) $(SYSROOT_CFLAGS_FOR_TARGET)
+ SYSROOT_CFLAGS_FOR_TARGET = @SYSROOT_CFLAGS_FOR_TARGET@
+ CXXFLAGS_FOR_TARGET = $(CXXFLAGS) $(SYSROOT_CFLAGS_FOR_TARGET)
+ LIBCFLAGS_FOR_TARGET = $(CFLAGS_FOR_TARGET)