For those feeling energetic…

Download and install XChat.

Download and install Chicken.

Install the packedobjects extension (egg) by running

sudo chicken-setup packedobjects

Download and unpack the thumbtribes source.

On Linux run

csc -s thumbtribes.scm xchat_init.c

On Mac OS X

csc -s thumbtribes.scm xchat_init.c -L "-bundle -flat_namespace -undefined suppress"

The result of the build will be a shared object file which can be loaded into XChat.