README.rst and build script consider installing wxwidgets with gstreamer support but:
Single reference to gstreamer in the code: MEDIABACKEND_GSTREAMER
The backend does not seem mandatory.
Everything compiles fine without gstreamer flag for wxGTK and gstreamer not installed.
Just forced the install via: emerge --nodeps wxpython (checking all other deps satisfied)
Should be up to the client application to determine if it need gstreamer support for wxpython, not to the bindings. Like other packages not using bindings does when checking wxGTK[gstreamer].
I encourage to add a gstreamer flag to wxpython instead of this mandatory dependency.
*** Bug 860036 has been marked as a duplicate of this bug. ***