Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/258#issuecomment-38879651
So it seems that on OS X, mktemp needs a template:
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/mktemp.1.html.
Just doing `mktemp -d` would fail. The best way to run it there will be
`mktemp -d -t spark`, which will put a file in TMPDIR with "spark" in its name.
If that also works on GNU mktemp, we can go wit that.
The pushd/popd errors are because mktemp failed, but that was earlier in
the log.
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