Change:
<ins> { stdenv, fetchurl, pkgconfig , glib , gtk2 , gst_all_1 , gnome , libnotify , libxml2 , libunique , intltool }: stdenv.mkDerivation rec { version = "0.3.4"; name = "alarm-clock-applet-${version}"; src = fetchurl { url = "http://launchpad.net/alarm-clock/trunk/${version}/+download/${name}.tar.gz"; sha256 = "1mrrw5cgv0izdmhdg83vprvbj6062yzk77b2nr1nx6hhmk00946r"; }; buildInputs = [ pkgconfig glib gtk2 gst_all_1.gstreamer gnome.GConf gnome.gnome_icon_theme libnotify libxml2 libunique intltool ]; meta = with stdenv.lib; { homepage = http://alarm-clock.pseudoberries.com/; description = "A fully-featured alarm clock for your GNOME panel or equivalent"; license = licenses.gpl2; platforms = platforms.linux; maintainers = [ maintainers.rasendubi ]; }; } </ins>

Discussion:
After installing and running doesn't show the additional plugins. Anyway, one can set to e.g. and the plugins are properly loaded.
Wasn't this fixed yet?
Doesn't work for me on master.
I think it's questionable whether this is desirable. We've had a similar discussion about python packages. In the case of similar plugins there's also the possibility that the version combination might make them incompatible; upstream packages typically assume that the packaging system ensures consistency, so this may result in ugly failures.
It seems like we still need some solution to this; we're shipping stuff that can't work: That's with all the plugin packages and everything installed. Add to the environment, though:
I have same thing here, 17.09. gst-play-1.0 foo Failed to create 'playbin' element. Check your GStreamer installation. I am also affected by this bug: , which was closed but the problem still happening. I noticed that most people with this bug have 2+ soundcards. Does it apply here? I am so frustrated that I am thinking about going gentoo..
EDIT: The problem was that the config key needs to be output, not sink -- and that I need to get more sleep.
I want to report that my issue was not this bug, but bug in KDE plugin system , which was only present in 17.09 release (not present in 18.03) and for 17.09 the community helped me craft a workaround. It seems that the bug applies to gst-play-1.0, and it needs a wrapper to actually see the environment, as in the post of
I was experimenting with on current master (). And it only dsiplays 1 plugin: I installed all of the following in my : What I would expect is for from to list all the plugins. Also setting doesn't help as doesn't even exist. Is there something I'm missing? EDIT: works. Now I'm wondering if there is a way to make this more seamless? EDIT2: Apperently the is already properly set in  to: However for some reason it gets replaced in the final file the get replaces by which causes the expasion to fail. It is probably an issue with . EDIT3: Issue might be caused by this:
Thank you for your contributions.

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I think this was fixed in