[MacPorts] #53583: ncview fails on libudunits2.a test

[MacPorts]

#53583: ncview fails on libudunits2.a test
------------------------------+-----------------
  Reporter:  basmac           |      Owner:
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  ncview udunits2  |
------------------------------+-----------------

Comment (by pgf):

 I was able to bypass this problem creating a symbolic link to
 `libudunits2.dylib`:
 {{{
 cd /opt/local/lib
 sudo ln -s libudunits2.dylib libudunits2.a
 }}}
 It seems that `libudunits2.a` is checked at configure time only.

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Ticket URL: <https://trac.macports.org/ticket/53583#comment:5>
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