[MacPorts] #40255: mapserver: configure fails when dependencies have not yet been installed

[MacPorts]

#40255: mapserver: configure fails when dependencies have not yet been installed
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  Reporter:  ryandesign@…  |      Owner:  jea@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.0
Resolution:                |   Keywords:
      Port:  mapserver     |
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Comment (by ryandesign@…):

 Add variants for postgis and postgis2, conflicting with one another, with
 one of them being the default. Let the user choose which one they want.

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Ticket URL: <https://trac.macports.org/ticket/40255#comment:2>
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