SUS is developed under SOLARIS Sparc. It is known to compile and has had extensive testing under SOLARIS 8,9 and 10 (sparc). It is known to compile under Ubuntu Linux (7.04 feisty fawn and 6.06 edgy eft) and has had limited testing on these systems. SUS tries to avoid non-portable contructs and SHOULD be easy to port to other UNIX platforms and systems. If you experience portability issues, contact the author. I do not promise to address any portability issues, but I will consider it. pdg@uow.edu.au