CVS and Subversion (SVN) are popular SCM systems that may be installed as plugins, as shown later. You'll have to make their needed directories:
#mkdir#/var/www/scmtarballsmkdir/var/www/scmsnapshots
These directories correspond to GForge configuration variables $sys_scm_tarballs_path and $sys_scm_snapshots_path.
For FHS-compliance, use /var/local/gforge/scmtarballs and /var/local/gforge/scmsnapshots.