[issue12379] build outside source fail in head

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

Benjamin: The mentioned commit is yours, so you probably have the best understanding of this change.

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nosy: +benjamin.peterson

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12379>
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