No, please look at the text I quoted above and the link it came from.I guess you mean ".FreeCAD".
/usr/lib/freecad/ does not exist on this system since the build is run in situ, and not installed. From what I gather here, that is what most people do when building from source.The equivalent system directory is "<system_freecad>/Mod"( which should be /usr/lib/freecad/Mod for ubuntu).
I do not have a package installed FreeCAD, I have master built in an out of tree location, not "installed", so I was expecting to put it with the other Mod code in freecad-build/Mod , that did not seem to be recognised.
again that seems to be a typo, not sure what it was intended to be.if you download zip,unzip,and
just copy the whole outermost directory FCGear into /freecad/Mod
I will try putting it in /home/<user> to test, though that is not really what I wanted to do.