Hello, I have a problem when compiling a project in Xcode. Well that's an exercise about OOP, and my mission is to implement the functions missed in that project. When I compile by Xcode, there was alot errors appeared, but when I use Makefile, then it's a piece of cake. I wonder why, using Xcode cannot do but using Makefile can. Someone please help me. PS: I upload my project, with the Makefile included.