Recent porting efforts
Two Linux ports have been contributed recently – MIPSEL and PowerPC (credits go to Fabrice Aeschbacher and Damyan Ivanov). Also, Paul Beach has ported v1.5.3 to HP-UX (already available for download) and Alex Peshkoff has almost completed porting the same version to AIX. And finally, port to Win64 (so far AMD64 and EM64T only) is committed into the HEAD branch and will be available in the v2.1 release.
via Firebird Developer’s Journal