dyld: Library not loaded: on OSX
If you're afraid of rebuilding all of the project, and there's no support available for such cases, make a bare bone clone of the required folders in /Users/oldname which contains all the files required by the project. 

Warning: This requires root password, and by default, /Users/ only contains:


All user accounts
Shared
Guest if enabled.


So I am not aware of the ramifications of the same.