Bug#988337: XDG_RUNTIME_DIR can be set in ~/.profile

[Christopher Huhn <c.huhn@gsi.de>]

Setting the $XDG_RUNTIME_DIR environment variable in ~/.profile or 
~/.bash_profile fixes this error.
The Gentoo wiki has an example: https://wiki.gentoo.org/wiki/Weston#Usage

XDG_RUNTIME_DIR is normally defined in 
/etc/X11/Xsession.d/20dbus_xdg-runtime.
I assume Xsession* is only for X and not for Weston/Wayland?

Best

Christopher