Gobject missing

I've just installed Matplotlib with the 2.3 version of

    > Python packaged by Enthought & believe I followed the
    > instructions on the Matplotlib web page. I am getting the
    > following error message:

Hi David,

Your paths to the GTK runtime library are not set properly. Check out

  http://matplotlib.sourceforge.net/installing.html

and the following pygtk FAQ entry addresses the PATH issue at length

  http://www.async.com.br/faq/pygtk/index.py?req=show&file=faq21.012.htp

Should cure what ails you,
John Hunter