* Steps to reproduce: Install python-pygobject with guix: `guix package -i python-pygobject` Install gtk+ with guix: `guix package -i gtk+`
$ python >>> from gi.repository import Gtk * Full message --8<---------------cut here---------------start------------->8--- Python 3.5.3 (default, Jan 1 1970, 00:00:01) [GCC 5.4.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> from gi.repository import Gtk /home/fis/.guix-profile/lib/python3.5/site-packages/gi/module.py:178: Warning: cannot register existing type 'AtkImplementorIface' g_type = info.get_g_type() /home/fis/.guix-profile/lib/python3.5/site-packages/gi/module.py:212: Warning: g_type_get_qdata: assertion 'node != NULL' failed type_ = g_type.pytype /home/fis/.guix-profile/lib/python3.5/site-packages/gi/types.py:235: Warning: cannot register existing type 'AtkImplementorIface' register_interface_info(cls.__info__.get_g_type()) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<frozen importlib._bootstrap>", line 969, in _find_and_load File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 664, in _load_unlocked File "<frozen importlib._bootstrap>", line 634, in _load_backward_compatible File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/importer.py", line 146, in load_module dynamic_module = load_overrides(introspection_module) File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/overrides/__init__.py", line 125, in load_overrides override_mod = importlib.import_module(override_package_name) File "/gnu/store/h29ggyz1wsmmk220gy811hy181lszz3y-python-3.5.3/lib/python3.5/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/overrides/Gtk.py", line 120, in <module> class Widget(Gtk.Widget): File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/module.py", line 183, in __getattr__ interfaces = tuple(interface for interface in get_interfaces_for_object(info) File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/module.py", line 107, in get_interfaces_for_object interfaces.append(getattr(module, name)) File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/module.py", line 222, in __getattr__ wrapper = metaclass(name, bases, dict_) File "/home/fis/.guix-profile/lib/python3.5/site-packages/gi/types.py", line 235, in __init__ register_interface_info(cls.__info__.get_g_type()) TypeError: must be an interface >>> --8<---------------cut here---------------end--------------->8--- * Platform Fedora 26 x86_64 * Version guix (GNU Guix) bad12e839c2f7823c45aa0121f7d5c9bb70905b7 I have the script running on Fedora with dependencies built by dnf, but not guix. I searched around, tried to find out what is missing. But it doesn't seem to be a problem caused by missing packages.