How do I convert a project to Mac?

I have a complete project I created for Windows for which I want to make a Mac version. I downloaded the Windows version from Source Control to my Mac computer, but I get the missing modules error asking to be rebuilt, yet rebuilding results in the could not be compiled, try rebuilding from source manually message.

What is a good workflow to get a working version I could open to accomplish this conversion, so I can package the Mac version?