[MacPorts] #48310: libpqxx @4.0.1: add postgresql94 variant

[MacPorts]

#48310: libpqxx @4.0.1: add postgresql94 variant
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  Reporter:  wichert@…    |      Owner:  ryandesign@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.3
Resolution:  fixed        |   Keywords:
      Port:  libpqxx      |
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Comment (by wichert@…):

 As far as I know the part command does not provide a simple way to
 generate a diff? What I normally do is ``port edit`` followed by ``port
 install`` until it works, but there is no ``port diff`` command that can
 give you a diff.

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Ticket URL: <https://trac.macports.org/ticket/48310#comment:3>
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