I'm running into issues trying to install Rails on OS X Lion using RVM. So far, I have done the following: Installed Mac OS X Lion Version 10.7 (Build 11A459e). Installed XCode 4.1 Developer Preview 5. Installed RVM. Installed a 1.8.7 version of Ruby via RVM using the command rvm install 1.8.7. Note: I need to be using 1.8.7 and not 1.9.2. Switched to the 1.8.7 version of Ruby using the command rv