It seems obviosu for those installing/compiling/packaging the port net-mgmt/p5-FusionInventory-Agent does require two prerequisite perl5 packages, not referenced by the port's Makefile as rundtime dependencies:
trying to start service fusioninventory on a host fails with errors refering to both missing packages not installed as dependencies by other ports.
It seems, that in cases were for security reasons HTTPS is required, the port
is also necessary.
I have to correct: replace devel/p5-File-which with sysutils/p5-File-which.