It looks like at some point in the past, someone decided x86-64 couldn't do gtk, so conditionally disabled it. This patch turns that disabling off, and apparently it works.
Defer to 3.1.1
bulk defer open issues to 3.1.2
you are correct Erik. Steve committed the patch but forgot to resolve the issue.
bulk close of all resolved issues in preparation for 3.1.3 release.