Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/333#issuecomment-71464164
-1
I think we need to add the `build-target` "directory" into the list of
ignored directories for apache rat. Rat will fail subsequent builds
```
1 Unknown Licenses
*******************************
Unapproved licenses:
build-target/conf/slaves
*******************************
```
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