PMD uses Maven and requires Java 9 for building.
PMD uses the maven wrapper, so you can simply build PMD as following:
./mvnw clean verify(on Unix-like platform such as Linux and Mac OS X)mvnw.cmd clean verify(on Windows)
This will create the zip files in the directory pmd-dist/target:
cd pmd-dist/target
ls *.zip
That's all !
Note: While Java 9 is required for building, running PMD only requires Java 7 (or Java 8 for Apex).
cd docs
bundle install # once
bundle exec jekyll build
You'll find the built site in the directory _site/.
For more info, see README in docs directory.