[MacPorts] #55390: lablgtk2 @2.18.3: error: use of undeclared identifier 'caml__frame'

[MacPorts]

#55390: lablgtk2 @2.18.3: error: use of undeclared identifier 'caml__frame'
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  Reporter:  domenic87  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:
      Port:  lablgtk2   |
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Comment (by domenic87):

 I saw lablgtk2 has no mantainer, is it possible for someone skilled to
 update the port to build with the "new" version of ocaml? We need this to
 have unison GUI working!

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Ticket URL: <https://trac.macports.org/ticket/55390#comment:4>
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