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PJ Eby authored
so that downloads aren't repeated and needed eggs are always installed, even if they were downloaded to the setup directory already. (backport from trunk) --HG-- branch : setuptools-0.6 extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4060066
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