Federico Beffa <be...@ieee.org> skribis: > l...@gnu.org (Ludovic Courtès) writes: > >> I don’t know if I’m missing something, but when I type ‘matplotlib’ at >> the prompt, I get: >> >> /gnu/store/g4m8q73cq4lym3v1ag7pnk5zv49mdifs-python-matplotlib-1.4.2/lib/python3.4/site-packages/matplotlib-1.4.2-py3.4-linux-x86_64.egg/matplotlib/backends/backend_gtk3.py >> in <module>() >> 19 except ValueError: >> 20 raise ImportError( >> ---> 21 "Gtk3 backend requires the GObject introspection bindings >> for Gtk 3 " >> 22 "to be installed.") >> 23 >> >> ImportError: Gtk3 backend requires the GObject introspection bindings for >> Gtk 3 to be installed. >> >> This may well be related to <http://bugs.gnu.org/20765>: Because Guix >> has incomplete dependency information, it might GC some of the things >> that these eggs refer to, and so things may or may not work depending on >> whether they have been GC’d. > > To solve this error I think you need to set > export GI_TYPELIB_PATH="$HOME/.guix-profile/lib/girepository-1.0" > We should probably add a search path specification for that.
Oh right. It’s actually in gobject-introspection, which makes sense but is inconvenient in this case. Not sure how to handle it. > For me it does display a window as expected, but it doesn't show the > curve (line in this case). Indeed, in: guix environment --pure --ad-hoc gobject-introspection pango gtk+ python-ipython -E ipython I get the behavior you describe, and the console shows alarming warnings like: TypeError: Couldn't find foreign struct converter for 'cairo.Context' which explains the blank page, I guess. If Python’s FFI uses GIR files, then that’s probably because it couldn’t find Cairo’s GIR files in $GI_TYPELIB_PATH? My 2¢, Ludo’.
