[MacPorts] #57347: unison +aqua does not build on Mojave

[MacPorts]

#57347: unison +aqua does not build on Mojave
--------------------------+---------------------
  Reporter:  miguelbarao  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.4
Resolution:               |   Keywords:  xcode10
      Port:  unison       |
--------------------------+---------------------
Changes (by mf2k):

 * keywords:  mojave => xcode10


Comment:

 This appears to be a problem with the new build system used by Xcode 10.
 {{{
 :info:build note: Using new build system
 :info:build 2018-10-11 15:04:55.143 xcodebuild[34941:85697] unexpected
 response: ErrorResponse(description: "unknown error while handling
 message: missingWorkspaceContext")
 :info:build error: Build service could not start build operation: internal
 error: failed to send the system info to the build service
 :info:build ** BUILD FAILED **
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57347#comment:2>
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