When starting sc-controller it fails due to missing Gtk namespace:

sc-controller 
Traceback (most recent call last):
  File "/usr/bin/sc-controller", line 12, in <module>
    gi.require_version('Gtk', '3.0') 
  File "/usr/lib64/python2.7/site-packages/gi/__init__.py", line 127, in
require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gtk not available


It seems to be a missing dependency, I tried to figure out which one, but
couldn't find which is the missing package.

The installed version of the sc-controller package is:

zypper info sc-controller
Information for package sc-controller:
--------------------------------------
Repository     : openSUSE-20181110-0                                         
Name           : sc-controller                                               
Version        : 0.3.6.2-1.6                                                 
Arch           : x86_64                                                      
Vendor         : openSUSE                                                    
Installed Size : 3.1 MiB                                                     
Installed      : Yes                                                         
Status         : up-to-date                                                  
Source package : sc-controller-0.3.6.2-1.6.src                               
Summary        : User-mode driver and GTK3-based GUI for the Steam Controller
Description    :                                                             
    Application allowing to setup, configure and use the Steam Controller
    without using the Steam client.


cat /etc/os-release 
NAME="openSUSE Tumbleweed"
# VERSION="20181116"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20181116"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20181116"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"


I tried also with the latest release and master from
https://github.com/kozec/sc-controller, this shows the same error message.