I've submitted Gambit as a proposed new port [1] for inclusion in the MacPorts packaging system [2].
Once the port is accepted, installing Gambit on a Mac OS X system will be as simple as:
# sudo port install gambit-c
I had to do quite a bit of patching [3] of the installation paths in the makefiles to comply with the MacPorts directory structure. Perhaps some of the changes, like prefixing installation paths with $(DESTDIR), could be integrated into future Gambit versions to ensure easier interoperability with various packaging systems including MacPorts.
Cheers, Arto
[1] http://trac.macports.org/projects/macports/ticket/11688 [2] http://en.wikipedia.org/wiki/MacPorts [3] http://trac.macports.org/projects/macports/attachment/ticket/11688/Portfile