[MacPorts] #56933: Can't install gtk3

[MacPorts]

#56933: Can't install gtk3
---------------------+--------------------
  Reporter:  coke    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
---------------------+--------------------

Comment (by coke):

 {{{
 $ sw_vers
 ProductName:    Mac OS X
 ProductVersion: 10.13.5
 BuildVersion:   17F77
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56933#comment:1>
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