i dont have -O3 in my CFLAGS yet when i emerge, libmpeg2 is built with it ...
- emake LIBMPEG2_CFLAGS= || die "emake failed" + emake OPT_CFLAGS="${CFLAGS}" MPEG2DEC_CFLAGS="${CFLAGS}" LIBMPEG2_CFLAGS= || die "emake failed" Fixed.
and with that change, the configure.in munging is no longer needed :)