[MacPorts] #59679: Unison 2.51.2_2 + aqua doesn't build on MacOS 10.13

[MacPorts]

#59679: Unison 2.51.2_2 + aqua doesn't build on MacOS 10.13
---------------------------+--------------------
  Reporter:  brunoomartin  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.2
Resolution:                |   Keywords:
      Port:  unison        |
---------------------------+--------------------

Comment (by mf2k):

 Error is:
 {{{
 xcode-select: error: tool 'xcodebuild' requires Xcode, but active
 developer directory '/Library/Developer/CommandLineTools' is a command
 line tools instance
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59679#comment:4>
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