Compiling 64-bit builds
Compiling 64 bit builds is supported with FB 1.04+ (and possibly earlier) on Linux and Mac OSX. Only lightly tested, no known problems. Win64 isn't tested and probably won't work.
The OHRRPGCE build system always defaults to compiling 32 bit binaries. To compile 64 bit binaries you just need a copy of FB with 64 bit libraries (it doesn't matter what arch the fbc binary itself is), and run:
If compiling FB yourself, do "make MULTILIB=64".