[issue28440] pip failures on macOS Sierra

Changes by R. David Murray : -- components: +Macintosh nosy: +ned.deily, ronaldoussoren ___ Python tracker ___

[issue28440] pip failures on macOS Sierra

New submission from Marc Culler: Changes made to /Library/Python on macOSX Sierra cause the --with-ensurepip compiler flag to fail, and lead to failures of pip after installing Python. The new file that causes the problem on Sierra is: /Library/Python/2.7/site-packages/Extras.pth The current