What is the OSX, C equivalent for uint32 and uint64?

I imagine this is a question that has been asked a thousand times but I can't find a straight answer.

I'm trying to port a very short, C function (initially written for Windows) to OSX, using XCode.

I've created an XCode, Terminal application project and I've copied and pasted the code into the project. XCode is giving me a bunch of errors telling me that the type uint32 and uint64 are unknown types.

What are the equivalent value types in OSX?