Forcing compiler

[Jeremy Huddleston]

I need to force gcc-4.2 when building mesa on Leopard, but it doesn't seem to be working:

DEBUG: Assembled command: 'cd "/opt/local/var/macports/build/_Users_jeremy_src_macports-trunk_dports_x11_mesa/work/Mesa-7.8" && /usr/bin/make -j5 default INSTALL_DIR=/opt/local RC_CFLAGS="-arch ppc" CC="/usr/bin/gcc-4.0 -I/opt/local/include" CXX="/usr/bin/g++-4.0 -I/opt/local/include"'


even though I have:

platform darwin 9 {
    # http://trac.macports.org/ticket/24345
    configure.compiler  apple-gcc-4.2
}

build.args-append \
    CC="${configure.cc} ${configure.cppflags}" \
    CXX="${configure.cxx} ${configure.cppflags}"

I also tried
configure.cc /usr/bin/gcc-4.2

but it's still using /usr/bin/gcc-4.0 when setting up build.args on Leopard...

What's wrong here?