+%define __pkgconfig_provides %{nil}
+%define __pkgconfig_requires %{nil}
+
+%ifnarch %{ix86}
+# arch-specific flags (like alpha's -mieee) are not valid for i386 gcc.
+# now at least i486 is required for atomic operations
+%define optflags -O2 -march=i486
+%endif
+# -z options are invalid for mingw linker, most of -f options are Linux-specific
+%define filterout_ld -Wl,-z,.*
+%define filterout_c -f[-a-z0-9=]*