Looking in the included file that apparently should define
'FFI_DEFAULT_ABI' (src/runtime/libffi/src/powerpc/ffitarget.h), it looks
like it requires 'POWERPC' to be defined, just as the x86 version of
that file requires 'X86' to be defined, for it to define
'FFI_DEFAULT_ABI'. In build/ffih/ffi.h it appears to be defined (wrongly
[for me]):
/* Specify which architecture libffi is configured for. */
#define X86
I have pushed several patches this afternoon that should (fingers crossed) fix this error, amongst others. If you could try it again that'd be great.
Andrew