Apologies if this is a naive question - I am quite new to the iPhone. I am trying to install iPhysics (1.1) but get an error "You must install BSD subsystem or Cydia first". Please can someone tell me what this means? I have a Jailbreaked 1.1.4 phone. Most other apps install and work fine (Caterpillar, Summerboard, etc). I do not really know what the BSD subsystem is - but get the sense that it is something not to be messed with...? Please help.