Comment # 6 on bug 954921 from Daniel Zeleny

(In reply to Stefan Dirsch from comment #5)
> Martin, that's what I've written already in comment #2.
> Daniel, please read again my comment #2.
> It's not SUSE developer's job to report packaging bugs of 3rd party
> packages. Seriously. Sigh. :-(

>From comment #2 it looks like, that issue is dependency on library, which is
not used in Slack. So I reopened bug when I have found, that this dependency
has its purpose. 
Comment #4 is a new information for me - libXScreenSaver exists in openSUSE,
only it has a different name.