[Bug 726831] Allow install to different path with pygobject3

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726831
  GStreamer | gst-python | unspecified

--- Comment #5 from 宋文武 <iyzsong at gmail.com> 2014-06-16 12:48:11 UTC ---
(In reply to comment #2)
> If you set PYTHON=python3 when compiling it will be installed in the python3
> prefix, then if you set it to python2 it will be installed in the python3
> prefix.

Sorry, I wrote a misleading bug title, and gave a unclearly description.
It can be installed but will not work correctly when installed into a different
prefix than pygobject3.

For example, what I have:
gst-python at /x/lib/python2.7/site-packages/gi
pygobject3 at /y/lib/python2.7/site-packages/gi
The GI overrides installed into different directories. 

Actually, I run into this bug when package pitivi for nixpkgs[1].
For nix[2] package manager, each packages must installed in its own unique
subdirectory.

We should modify some autotools stuff to make gi/overrides/__init__.py install.

[1] https://github.com/NixOS/nixpkgs/pull/2001
[2] http://nixos.org/nix/about.html

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