To create the jove manual (as opposed to the man pages) just do "nroff -ms jove.[12345]" (or ditroff or troff). That should do the trick. The man pages will be installed automatically by "make install" in the previous directory. And the online/run-time documentation will be installed automatically, too.
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.