Why doesn't MCR provide libmat.lib?

Why doesn't MATLAB Compiler Runtime (MCR) provide libmat.lib, libmx.lib, ...? I think it is a good idea that MathWorks releases these DLL import libraries to public, because more users will use its products.

[Meng-Yuan Huang]

Sorry, I found MCR R2013a did provide libmat.lib and libmx.lib, though MCR R2012b didn't.

[Jay Kemper]

So...where do we get libmat.lib for r2012b?