I get a linker error building a brand-new PhoneGap app from the command line. It creates a bunch of files, and if I open the created .xcodeproj in Xcode, it builds
This may be because your framework references are corrupted or point to nowhere. In the left of XCode under 'Frameworks' and 'Resources' try re-adding anything you added yourself. Chances are with Cordova its a plugin SDK you are using that has been updated or deleted.