Prerequisities

OpenBabel

VFLP requires OpenBabel to be installed, as it uses the command obabel command of this package.

OpenBabel can be installed locally in the home directory, or by system admins globally, or might be available as a module on the computer cluster. This information can be found often on the website of the computer cluster. If it is not installed, then contacting the admins of the cluster often is the way to go forward, since it is usually quite simple for them to install the package on the cluster.

The critical thing is that the obabel command is in the PATH and thus executable from anywhere.