The best way to build lernstickWelcome is on the Lernstick itself, because all dependencies are already installed.
Go into the Welcome program and install Netbeans.
Create a directory and clone lernstickWelcome and lernstick Tool
mkdir lernstickWelcome && cd lernstickWelcome
git clone https://github.com/imedias/lernstickWelcome.git
git clone https://github.com/imedias/lernstickTools.git
Open Netbeans and open the lerntickWelcome git-repo as project. Now there is missing dependency lernstickTools. To solve this problem import the lernstickTools git-repo.
cd ./lernstickWelcome
sudo apt-get install junit
dpkg-buildpackage -us -uc