If xapps is build without introspection then cinnamon-screensaver fails to start with the following exception: Traceback (most recent call last): File "/usr/share/cinnamon-screensaver/cinnamon-screensaver-main.py", line 18, in <module> from service import ScreensaverService File "/usr/share/cinnamon-screensaver/service.py", line 9, in <module> from manager import ScreensaverManager File "/usr/share/cinnamon-screensaver/manager.py", line 10, in <module> from stage import Stage File "/usr/share/cinnamon-screensaver/stage.py", line 8, in <module> import singletons File "/usr/share/cinnamon-screensaver/singletons.py", line 46, in <module> gi.require_version('XApp', '1.0') File "/usr/lib64/python3.4/site-packages/gi/__init__.py", line 102, in require_version raise ValueError('Namespace %s not available' % namespace) ValueError: Namespace XApp not available I would presume that gnome-extra/cinnamon also needs the same dependency change for the keyboard@cinnamon.org applet. I suppose I only found this out because the default/linux/amd64/13.0/desktop profile does not have introspection enabled. I noticed that most ebuilds with introspection support have +introspection to enable it by default, however x11-libs/xapps does not. Should the xapps use flag also be updated?
For full correctness, anything using some GIRepository should be RDEPENDing on the package providing that gir/typelib with a introspection USE dep. For python modules, this can be usually seen as "from gi.repository import Foo", possibly with a "gi.require_version('Foo', '3.0')" or some such before to pin it to an appropriate ABI (SLOT). What package needs to be depended on, if not obvious from the name, can be found out with something like qfile /usr/lib64/girepository-1.0/Foo-3.0.typelib if what's imported (or the first arg to require_version) is "Foo" and the version passed to require_version (second argument) is 3.0, in this example. And then a [introspection] USE dep for that. Hope this helps. But yes, because it's hard to keep this all fully correct, we've opted to mostly default install this stuff, as it's just some typelib and GIR mostly, usually around the 100kB size per package to support most other languages with the library. Though we do try to get the USE deps right for gnome packages on occasional reviews, perhaps cinnamon can manage on a best effort basis like gnome too :)
Thanks for the report. commit f06b9e2b58acb9ede492554c6274fae5584b0fbc Author: Kristian Fiskerstrand <k_f@gentoo.org> Date: Sat Feb 11 16:57:52 2017 +0100 gnome-extra/cinnamon-screensaver: Fix dep for xapps Require introspection use flag Gentoo-Bug: 606080 Package-Manager: portage-2.3.3
