1. Build distribution from source code package (apache-skywalking-x.y.z-src.tar.gz) by following this [doc](https://github.com/apache/skywalking/blob/master/docs/en/guides/How-to-build.md#build-from-apache-source-code-release).
1. Apache RAT check. Run `./mvnw apache-rat:check`. (No binary in source codes)