I ran into a problem with RCSci, as path entries did not work. I am in a chroot system, i.e. my path looks something like this:
/usr/home/<user name>/usr/......
While I have root access in telnet, CGIs invoked via browser cannot read the directory areas above <username> - therefore the path to RCSci (/usr/bin/) did not work.

This was resolved simply by copying ci over to my own directories; in my system the command was:
cp /usr/bin/ci /usr/home/<user name>/usr/bin/ci

(Seems obvious, but no one could tell me or suggest this when I asked.. so I figured I would add a note).