Review Request 70388: Replaced os.path.exists() with a proper check of automake flags.

[Andrei Sekretenko]

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Review request for mesos and Benno Evers.


Bugs: MESOS-9699
    https://issues.apache.org/jira/browse/MESOS-9699


Repository: mesos


Description
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Replaced os.path.exists() with a proper check of automake flags.


Diffs
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  src/python/native_common/ext_modules.py.in 
eee56a94705b561794b1ee8e495701c0bba695f1 


Diff: https://reviews.apache.org/r/70388/diff/1/


Testing
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Thanks,

Andrei Sekretenko