Alternatively, you can check out the complete source tree using anonymous CVS:
cvs -d:pserver:anonymous@cvs.hup.sourceforge.net:/cvsroot/hup login
cvs -d:pserver:anonymous@cvs.hup.sourceforge.net:/cvsroot/hup co hupYou're also welcome to join the project as a developer and commit your improvements to the CVS repository. To do so, visit the SourceForge and apply for an account. For more details please visit the Site Documentation page of SourceForge.