[Numpy-discussion] how to use install_clib with setup.py?

I have a question concerning install_clib on windows. What I want to do is to copy a dll (libopenblas.dll) to the numpy/core folder with setup.py install. The path to the dll is given in site.cfg. The dll itself is a external dependency. Somewhere i found a reference to install_clib to copy external dll's, but howto to apply this within setup.py? Regards Carl