Yes, I have both the GCCG client and server running on Mac OS X 10.6 (Snow Leopard).
In short, I followed the "source install guide" on the GCCG website. Since I followed the "source install guide", I didn't have to figure out how to get Fink installed (since you don't need it).
More Details (expanding upon the instructions on the GCCG website):
[These instructions are a little technical, so being computer-savvy does help.]
You will first need Xcode installed. It is included on your Mac OS X install DVD. Once Xcode is installed, continue with these steps.
There are several "libraries" you need to install:
libjpeg (not listed in the GCCG website instructions, but you need it -- just Google for it and download the source)
libpng (not listed in the GCCG website instructions, but you need it -- just Google for it and download the source)
libvorbis (not listed in the website GCCG instructions, but you need it -- just Google for it and download the source)
libogg (not listed in the website GCCG instructions, but you need it -- just Google for it and download the source)
SDL 1.2+;
SDL_image;
SDL_net;
SDL_ttf;
SDL_mixer;
For each of these libraries do the following:
1) Download it (it will be a compressed file)
2) Unpack the compressed file (double-click on it)
3) Open Terminal
4) Change the current directory to the directory your just unpacked, by using "cd <directory name>"
5) Run "./configure"
6) Run "make"
7) Run "sudo make install" (enter your password)
8) The library should now be installed at /usr/local/lib.
Once you've done this for each of the libraries successfully you may install GCCG.
1) Download it (it will be a compressed file)
2) Unpack the downloaded file (double click on it).
3) Open Terminal
4) Change the current directory to the directory your just unpacked, by using "cd <directory name>"
5) Run "./gccg_package install client fonts source"
6) Run "make all"
7) Run "./gccg_package install lotr"
8) Run "./gccg_package install lotr-cards*"
GCCG is now installed.
9) Run "./Lotr"
GCCG you should now be running GCCG. :-)