I don't have any python-gnome* packages installed.
The winki ebuild depends on pygtk but winki itself needs some sort of "gnome" module that does not seem to be provided by pygtk.
(process:21953): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
Traceback (most recent call last):
File "/usr/bin/winki", line 48, in <module>
from gnome import program_init
ImportError: No module named gnome
Issue still present as ofdecember 2015 (winki-0.4.5-r1)