Firebird V2.1.2 Classic for MacOSX (PowerPC) is available for download.
Firebird Project has now ports for the top4 embedded processors used in small devices like phones
The top cpu used in that area are arm,x86,mips,powerpc according to linuxdevices survey
Here are the build results for firebird2.0 package on debian on main cpu architectures used in debian
The latest port is for arm cpu , and here is the devel-thread
you can read his macosx porting adventure
Firebird V2.03 Classic and SuperServer for MacOS (powerpc) are available for download. Thanks to Paul Beach and Alex Peshkov.
You can install firebird 2.0.x on these new ports for debian : kfreebsd-amd64 kfreebsd-i386 powerpc sparc