Build GeoTools:

    cd ~/projects/geotools
    mvn clean install -DskipTests -T 4C

(Skip the `-T 4C` for Maven 2.)

Build GeoServer and prep Eclipse project:

    cd ~/projects/geoserver/src
    mvn clean install -DskipTests -T 4C
    mvn -P wps,script,script-js eclipse:eclipse