Kerberos Authentication against CUPS with GTK3+ Applications

[Julian Rinderspacher]

Dear Package Maintainers,

I have been trying to kerberize our printing system.
We use a cups Server Version 2.2.1-8+deb9u2 on a debian stretch machine,
MIT Kerberos Version 1.12.1+dfsg-19+deb8u4 on a debian jessie machine and
client PCs with debian buster.

I assume that my cups and kerberos configuration is correct as printing and
the prior acquisition of a kerberos ticket work with non-gtk applications
namely lp, lpr, libreoffice and some qt based document viewers.

I would now like to be able to print from gtk applications specifically
evince and zathura with an authenticated Operation Policy in cups
(DefaultAuthType Negotiate).

As implied by this commit
https://salsa.debian.org/gnome-team/gtk3/commit/2c5ae21cdc6161dc4cf42b2107d74d92b6f303be
the functionality should be present.

I'll be glad to supply configuration details and log messages on request
(as there are many).
Any pointers on what to configure, where to look or even who else I should
ask are much appreciated.
Currently I am not a subscriber to this mailinglist.

Kind regards,
Julian
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