I\'m following the pycairo installation instructions here : http://www.cs.rhul.ac.uk/home/tamas/development/igraph/tutorial/install.html to install pycairo for use with igr
I kinda solved the problem installing the Gtk-Bundle for Windows, wich had the third party dll dependencies.
(I did a dirty solution by pasting the dlls directly into c:/Python27/lib/dist-packages/cairo, because I am not used to Windows anymore and don't know for sure what is the expected place for the dlls to go.)
But my scripts started to work at last.
Open _cairo.pyd in Dependency Walker and figure out what it's missing.