[MacPorts] #54878: ghc at 7.8.3_5+universal: Failed to build on macOS 10.13

[MacPorts]

#54878: ghc at 7.8.3_5+universal: Failed to build on macOS 10.13
------------------------+------------------------
  Reporter:  vovinacci  |      Owner:  neverpanic
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.99
Resolution:             |   Keywords:  highsierra
      Port:  ghc        |
------------------------+------------------------

Comment (by vovinacci):

 It's a stupid copy-paste from me in fact. It's doesn't have universal
 variant added
 {{{
 port installed ghc
 The following ports are currently installed:
   ghc @7.8.3_5 (active)
 }}}

 Unfortunately I cannot edit ticket. If anyone could remove '+universal'
 from header and ticket description, that would be great.

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Ticket URL: <https://trac.macports.org/ticket/54878#comment:3>
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