binary package downloading/extraction (prebuilt contribs)

### Software that fails to build on MacOSX intel

SDL_image
    Undefined symbols (missing OpenGL framework?)

dvdcss
    Undefined symbols (missing CF framework?)

gnutls, gpg-error
    infrastructure mismatch between Makefile.in.in and autoconf macros (different gettext vers)

### Missing software for MacOSX (was present in extras/contrib)

# These 3 are binary framework downloads : no source code is used
BGHUDAppKit
Growl           -- last free version: 1.3.0: http://code.google.com/p/growl/source/list http://itunes.apple.com/us/app/growl/id467939042
Sparkle