Note: This article applies to Xcode 4 with wxOSX/Cocoa 3.0.0 but should work also for 2.9.5 (before that, some files are missing (like the wx_cocoa.xcodeproj (file that builds the libraries). For older versions of OSX/Xcode, see Creating Xcode 3 projects for wxWidgets applications Create the library This part is pretty simple. Open the file "wxcocoa.xcodeproj" located in the "wxWidgets-3.0.0/build