(In reply to Christophe Fergeau from comment #7)
> rest-0.7.92-3.el6 was missing from the buildroot when virt-viewer-2.0-15.el6
> was built, causing the check for rest_proxy_auth_cancel() to fail.
>
> https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=12223676 is a
> scratch build built against rest-0.7.92-3.el6
This scratch build works well.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2017-0587.html