The initial MacOS X binaries have been linked to libgmp.dylib using some
mad path in /opt that's now hard-coded into the program. Consequently,
$DYLD_LIBRARY_PATH must contain the place where libgmp really is for
those binaries to run correctly. Tested on i386-apple-darwin9.7.0.
svn path=/nixpkgs/trunk/; revision=17873