The XDG specification asks applications to fall back to a replacement directory with similar capabilities and print a warning message, rather than to blow up. http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html http://cgit.freedesktop.org/wayland/wayland/tree/src/wayland-server.c#n1102
The problem with this is that we cannot arrange for a replacement with "similar capabilities" automatically. It's very hard to give all the guarantees required when you're not a distribution integrator. I recall this has been discussed before. Some random seach hits: http://lists.freedesktop.org/pipermail/xdg/2015-June/013517.html http://lists.freedesktop.org/archives/xdg/2012-December/012593.html But the email I was actually looking for is: http://lists.freedesktop.org/archives/wayland-devel/2012-June/003935.html It has been thought about before, and concluded that it is best to not try to make up some replacement that may or may not work correctly. I would be tempted to close this as WONTFIX, but let's see if there are better ideas today.
Doesn't seem like anyone had better ideas, so closing as WONTFIX.
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