Hi Guix,

python-h5py is currently broken.

   guix environment --ad-hoc python-2.7.10 python2-h5py
   python
   >>> import h5py
   [weird error]

The immediate reason here is that an Egg archive is built and installed
instead of a directory.  Python doesn’t seem to know how to import
modules whose contents are trapped in an Egg archive (or is this only
the case when setuptools are not in the profile?).

I found that removing ‘python-setuptools’ from the ‘native-inputs’ field
changes the behaviour such that no Egg archive is built and the library
files are installed plainly.

Another problem with h5py was that it didn’t actually build against our
hdf5 library, because it looked for the library and the headers under
‘/opt/local’ and ‘/usr/local’.  I fixed this by adding an additional
build phase.

The commit message is a little ugly, but I think it is correct.  I’m not
a Pythonista but it seems that python-h5py now works fine (at least
there are no weird error messages anymore).

~~ Ricardo