that's a really old version of the gstreamer sdk that is not supported anymore. debian has much newer versions of gstreamer in their official repos.
the sdk repo is probably conflicting with the versions that need to be installed. try removing that repository and running the script again.
in any case OF should be able to run with and older gstreamer so if you need to keep that version for some reason you can also modify the install dependencies script to remove the installation of gstreamer
