how to Recompile motmod.ko?

i want to know how to Recompile motmod.ko,because i want to modify it.I don't know how it was generated.

The short story is to clone the branch you wish to change then in a terminal window in the /somename/src you do the following

Then in the top most directory you do the following
Some incomplete information here: linuxcnc.org/docs/2.7/html/code/contributing-to-linuxcnc.html

JT

thanks