vadm depends on the py lib which provides programmatic access to subversion by using the ‘svn’ command line tool. The vadm scripts also will make use of the sudo command which usually is available on Unix and OSX systems.
download the vadm tarball and install it like this (substitute the version number as appropriate):
tar zxvf vadm-X.Y.Z.tar.gz
cd vadm-X.Y.Z
python setup.py install
If you want to follow the development version you can type something like this:
svn co https://codespeak.net/svn/vadm/dist/vadm
and add the vadm/bin/ directory to your $PATH variable. The vadm script will automatically use the development version.