gedit xmltools plug-in fails miserably on installation

Also, python is installed, as is python3

# python --version
Python 2.7.6

# python3 --version
Python 3.4.3

In Makefile I changed the 5th line from:
   py_compilefiles *.py
to
   pycompile *.py

But it doesn't work anyway..

In the Gnome documentation the GEdit plugins seem to be placed in another directory
(see https://help.gnome.org/users/gedit/stable/gedit-plugins-install.html.en)

I tried to copy the files in those two directories:
~/.gnome2/gedit/plugins (like Makefile installation option)
and
~/.local/gedit/plugins (like Gnome documentation)

But in the Modify->Preferences->Plugin it does not appear any new entry.