I don't have any development tools installed that I know of. I searched macports, fink and homebrew - didn't find anything. Custom QT? I've got QT Pro, with Flip4Mac installed... Although, while in Terminal I do see an option for Homebrew. In Terminal, > Shell > New Window > Homebrew As for using Terminal, not sure what to do here as per your instructions. I've got Terminal open, and if I enter 'otool -l max.xpl' it says command not found. Can you please clarify exactly what I need to do to. Screenshot of my CRJAvionics folder attached. My latest install is located here: FCP/X-Plane 9 Demo/Aircraft/X-Aviation/CRJ-200/plugins/CRJAvionics...