Prepare to Make Unreal Games with Unreal Engine – Installing and Setting Up - Learning Unreal Engine iOS Game Development - page 12

XCode 5.1 or higher
As you saw in the previous steps, we used XCode to build our engine because it is the main
IDE for Mac OS X. It is an essential tool and we will need it again anytime we want to re-
build the engine or write a C++ game using the generated project from Unreal Engine. As
Epic has outlined, for Mac users, the minimum version to be used with Unreal Engine 4.x
should be 5.1.