Using mingw-pkg to build gcc 5.3.0

I have set up the downloaded gcc 5.3.0 with src and adjacent build 
directories, with gmp, mpfr, and mpc set up in the appropriate 
places. There are no problems here, this is all the same as I did for 
builds of previous releases.

I have used git to get  mingw-pkg from
https://sourceforge.net/u/keithmarshall/mingw-pkg/ci/master/tree/

Now I do have problems. How do I install and configure mingw-pkg 
so that  I can use it?

I found no useful information at www.mingw.org - the web site has
not been updated.



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