setting to_scan to [] instead of None ensures (somewhat confusingly) that find_links are used, when available, to install each dist listed in setup_requires
setting to_scan to [] instead of None ensures (somewhat confusingly) that find_links are used, when available, to install each dist listed in setup_requires

--HG--
branch : distribute
extra : rebase_source : 4efd4ba05e527df60a33c55da30c19586a9cecdb

pypa/setuptools,pypa/setuptools,pypa/setuptools