Hi, I was able to build LuaJIT 2.0.0 on my iBook G4 running OS X 10.5.8, there are two issues: 1. OS X comes with gcc 4.0.1 (default) and 4.2.1, but 4.3+ is required by LuaJIT for ppc. I commented out the #error. 2. Calling FFI C functions seems to crash: (gdb) run Starting program: /Users/anders/LuaJIT-2.0.0/src/luajit Reading symbols for shared libraries ++. done LuaJIT 2.0.0 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/ JIT: ON fold cse dce fwd dse narrow loop abc sink fuse > ffi = require 'ffi' > ffi.cdef[[ int system(const char *); ]] > =ffi.C.system('echo hi') hi Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x0000810c 0x000080c8 in main () (gdb) I understand LuaJIT on PowerPC OS X may not be a priority, I just wanted to let you know that it almost works. -- Anders Bergh