[MacPorts] #54331: libass-0.13.7 not building on macOS 10.12.5 + Xcode 8.

[MacPorts]

#54331: libass-0.13.7 not building on macOS 10.12.5 + Xcode 8.
------------------------+--------------------
  Reporter:  ssisak     |      Owner:
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:  duplicate  |   Keywords:
      Port:  libass     |
------------------------+--------------------

Comment (by ssisak):

 Got it:

 {{{
 sudo port upgrade readline gawk
 }}}

 and then another

 {{{
 port upgrade outdated
 }}}

 Got things moving again -- assuming somethings missing a dependency on
 gawk.

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Ticket URL: <https://trac.macports.org/ticket/54331#comment:4>
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