[R] Convert windows source package for Mac use

[Warthog]

Hi, 
I am on a Mac. 
Is there a way to convert a Windows source package so it can be installed on a Mac?

I have a package in zip form from a friend who runs Windows. 
I THINK that it is in compiled format for Windows. 
The Description says: 
Built: R 3.1.2 x86_64-w64-mingw32....windows 

I tried to convert it to a tgz then Install/Load on Mac R, but I get the error message: 
Error: package 'package' was built for x86_64-w64-mingw32 

I can run Windows on Parallels Desktop, and the original zip format installs and loads OK. 

I'd prefer to run R on my Mac. 
Sorry if this is a stupid question: I read the R-exts and it doesn't say if you can or cannot do this. 

Thanks, 
Alan 
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