Thank you for the response. On 2015年05月08日 09時23分, Jan Alexander Steffens wrote: > Have you installed the gstreamer0.10-plugins? I can find this package neither with $( pkgfile -ir 'gst.*plug' ) nor by searching the package database online. Here is what I do have installed: ■ pacman -Q | grep 'gst.*plug' gst-plugins-bad 1.4.5-2 gst-plugins-base 1.4.5-1 gst-plugins-base-libs 1.4.5-1 gst-plugins-good 1.4.5-2 Though it seems the pychess package lists none of these as relevant. Perhaps this is a packaging error? ■ pacman -Qi pychess Name : pychess Version : 0.10.1-4 Depends On : gnome-icon-theme python2-rsvg pygtksourceview2 gstreamer0.10-python desktop-file-utils Optional Deps : None