Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1049#issuecomment-134298584
Apparently, the `readlink` utility is not part of POSIX. So we might have
to revert to the old way of parsing the output of `ls -ld` to stay compatible.
It is actually more reliable than I thought because POSIX specifies that the
output of `ls -ld` should always be of the form "link_name -> target".
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