[Yhc] Trouble building yhc on Mac OS X Leopard / x86

I did scons It crashed about some .h x86/ffi/darwin. So I did scons fullclean scons depends and it got much further (I presume...) but now it says libgmp must be install and gmp.h made accessible before you can compile Yhc which is odd since I installed them with MacPorts, in /opt/local/lib and /opt/local/include; they are there, and Sconstruct has those paths in the lines: env.Append(CPPPATH=["/usr/local/include", "/opt/local/include", "/Library/Frameworks/GMP.Framework/Headers"]) env.Append(LIBPATH=["/usr/local/lib", "/opt/local/lib", "/Library/Frameworks/GMP.Framework"]) so I was puzzled where to go next... Just wanting to play with Yhc on my Mac... Any help wouyld be appreciated. Thanks, Jared.