[MacPorts] #60613: virt-manager: Registry error: gtk2 not registered as installed & active

[MacPorts]

#60613: virt-manager: Registry error: gtk2 not registered as installed & active
------------------------+--------------------------
 Reporter:  ryandesign  |      Owner:  danchr
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  virt-manager
------------------------+--------------------------
 https://travis-ci.org/github/macports/macports-ports/jobs/695596906

 {{{
 Failed to parse file gnome/virt-manager/Portfile: Registry error: gtk2 not
 registered as installed & active.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60613>
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