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Cacti is an application that is very old and outdated. There is very little usable documentation and the code is extremely poorly documented with almost no comments written within. The Geant implementation which includes many changes from the original code, makes it almost impossible to ascertain it's relation to any sort of packaging or version control. For instance we have code running for a old developers home directory. Many of the programs and scripts don't use the systemwide configuration files so it is different ascertain what uses what.
To put this application into our standard environment system would take a great deal of work. I would not want to attempt it with a serious commitment to this software which I understand is planned for expiration.