MacOSX linker doesn't understand -R flag at all, no matter how you feed it the flag.  Punt and return a -L flag instead (returning "" gums up the command to be forked).
MacOSX linker doesn't understand -R flag at all, no matter how you feed it
the flag.  Punt and return a -L flag instead (returning "" gums up the
command to be forked).

pypa/setuptools,pypa/setuptools,pypa/setuptools