Hi Guix,

I'm currently attempting to package GNU Solfege, a Python application
using PyGTK which uses the gnu-build-system.  Attached is the current
state of my changes.

I need to wrap the executable /bin/solfege to make sure that the
PYTHONPATH is set such that pygtk, pygobject, pycairo and so on can be
found.  Unfortunately, even with the wrapper solfege fails because it
cannot find pygtk:

   Traceback (most recent call last):
     File "/gnu/store/mq8zh2ajimn91hsxkrvf2a5pyi0v6gjs-solfege-3.22.2/bin/.solfege-real", line 55, in <module>
       from solfege import presetup
     File "/gnu/store/mq8zh2ajimn91hsxkrvf2a5pyi0v6gjs-solfege-3.22.2/share/solfege/solfege/presetup.py", line 22, in <module>
       import gtk
   ImportError: No module named gtk

With strace I see that python attempts to load the gtk module from all
the places specified in the PYTHONPATH (and a few more), but it does not
actually enter the "gtk-2.0" subdirectory declared by the pygtk.pth
file.

When I explicitly add
/gnu/store/...-pygtk../lib/python2.7/site-packages/gtk-2.0 to PYTHONPATH
the application progresses a little further and then fails to load
"gio", which is also located in a "gtk-2.0" subdirectory rather than the
root of a "site-packages" directory.

pygtk and pygobject both come with .pth files that instruct Python to
check out the "gtk-2.0" subdirectory, yet these files are seemingly
ignored as (according to strace) Python makes no attempt to look inside
the declared subdirectories when Solfege starts up.

I would be glad for any insights you might be able to share.

~~ Ricardo