Porting to x86_64/darwin (Mac OS X)

[OZAKI Kiichi]

I have made a patch for porting to x86_64/darwin,
since i386/darwin gprolog does not work correctly, on my 10.7/Xcode 4.1.

https://gist.github.com/raw/1191268/cc578723a0fd85d7bc63a5b37b579dfb90a44bc6/patch-x86_64-darwin.diff

$ ./configure --build=x86_64-apple-darwin --host=x86_64-apple-darwin
$ make

It can be built by any of gcc/llvm-gcc/clang, and seems to work OK.

Regards,
OZAKI