media-sound/pithos-1.0.1 fails to launch with the following output:

Traceback (most recent call last):
File "/usr/lib/python-exec/python3.3/pithos", line 9, in <module>
load_entry_point('pithos==1.0.1', 'gui_scripts', 'pithos')()
File "/usr/lib64/python3.3/site-packages/pkg_resources/_init_.py", line 519, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib64/python3.3/site-packages/pkg_resources/_init_.py", line 2630, in load_entry_point
return ep.load()
File "/usr/lib64/python3.3/site-packages/pkg_resources/_init_.py", line 2310, in load
return self.resolve()
File "/usr/lib64/python3.3/site-packages/pkg_resources/_init_.py", line 2316, in resolve
module = _import_(self.module_name, fromlist=['__name__'], level=0)
File "/usr/lib64/python3.3/site-packages/pithos/pithos.py", line 25, in <module>
gi.require_version('Gst', '1.0')
File "/usr/lib64/python3.3/site-packages/gi/_init_.py", line 100, in require_version
raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gst not available