GRASS GIS on Mac OS X

giflib/libungif version: 4.1.3
giflib/libungif

You have a couple choices. giflib is the simplest, and you can create true compressed GIFs now. Since the UniSys LZW patent has expired it's a good choice, if you want to create true GIFs (not that GIF is such a good format ^_^). If you're STILL worried about patents (apparently IBM has a patent on it in the US also that expires in 2006, tho they're probably a lot nicer about it), go for libungif.

In a Terminal type:

$ cd path_to_folder_containing_libungif_source.tar.gz
$ tar -zxf libungif-4.1.6.tar.gz
or
$ tar -zxf giflib-4.1.6.tar.gz

Then, if you're using libungif, a patch - everything I've seen so far looks for libgif, nothing falls back to libungif if it can't find libgif. So we'll build this as libgif: in lib/makefile.in and util/makefile.in, replace all occurrences of libungif.la with libgif.la. Then continue:

$ cd libungif-4.1.6
or
$ cd giflib-4.1.6
$ ./configure --mandir=/usr/local/share/man
$ make
$ sudo make install