Auth plus is an advanced open-source authorization plugin designed for both Spigot and BungeeCord. Its aim is to simplify user authorization in servers of any scale.

1. Build spigot version 1.8 using BuildTools.
2. Install compiled JAR (mvn install:install-file -Dfile=lib/spigot-1.8-R0.1-SNAPSHOT.jar -DgroupId=org.spigotmc -DartifactId=spigot -Dversion=1.8-R0.1-SNAPSHOT -Dpackaging=jar).
3. Execute mvn clean install in the main directory.