Grr.
Here's a good idea:
Forget Installer. Forget RIPDev. Both of them are crap. Installer is no longer what it used to be. It barely works, and has almost no packages. You do not need UNIX Subsystems from Installer. Delete Installer and use Cydia.
And like I said before, you already have what you need (BSD Subsystems) if you installed Cydia. So there's no use in even worrying about BSD Subsystems. Just, trust me. Please.