Trying to update to WxWidgets-3.1.5

I am trying to update Wx to use libs from wxWidgets-3.1.5   (using
visual studio 2019)   I am able to get Alien to install the libs and
headers.  I can fudge to get almost all of Wx to build.  However I am
manually modifying the c files (generated during make)    This seems
wrong.  Can anyone explain how the XS, xsc, etc files are generated?
I can see that some are updated / created during perl Makefile.PL and
some are done during make.  My  previous XSUB experience is at a much
simpler level (adding a custom lib or adding methods to existing
modules)
I appreciate any help you can provide.
Thanks,


-- 
Don Peddicord