Okay, I’m assuming you have the Mac developer tools installed. You can’t build a C++ project if you don’t. If you have Xcode, the project worked okay on Windows, and won’t compile on the Mac, most likely there’s something platform specific in the code. It could just be something as simple as a #region call or a platform-specific #pragma. It could also be the use of a platform-specific library.
To figure it out, go to the Finder and navigate to your .uproject. Select it in the finder, and then go to menu Finder -> Services -> Generate Xcode Project
This will create an Xcode project. Launch it, change the configuration to Mac Editor, and press ⌘B to build. It should fail to build, but the build log will give you more detailed information about why it failed. If you don’t know how to fix it, post the log here and we can help.
If it does build, press ⌘R to run and it will launch your project with the compiled module.