Freestars currently compiles under MSVC 6.0 (5.0 doesn't appear to work due to STL compatibility issues). Compiling under GCC doesn't work yet, but it's being worked on.
In order to compile Freestars, you'll need the TinyXML library found at http://tinyxml.sourceforge.net/ . For exact instructions, please review this document: https://sourceforge.net/docman/display_doc.php?docid=23207&group_id=110390 .