Unless otherwise stated, all GPL software Future Lab builds can be compiled on any of the following platforms.
The specific compilers mentioned are the ones that I have tested. Most Linux/Unix code is written in a platform independent manner so it (in most cases) can be compiled for any flavour of Unix.
I have successfully run (but not throughly tested) all the TCL GPL software on the following platforms:
This page completely discusses the platforms that Tcl is available on.
If you have compiled the Future Lab GPL source code for a platform not listed here, please drop me a line. I will try and post the package.