[MacPorts] #60340: gfortran library not found in building demeter

[MacPorts]

#60340: gfortran library not found in building demeter
-----------------------+-----------------------
  Reporter:  paulfons  |      Owner:  joefowler
      Type:  defect    |     Status:  reopened
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:
      Port:  demeter   |
-----------------------+-----------------------

Comment (by kencu):

 On 10.13, {{{demeter}}} installs as-is, without any trouble, without
 touching the existing Portfiles.
 {{{
 $ port -v installed demeter
 The following ports are currently installed:
   demeter @0.9.26_0 (active) platform='darwin 17' archs='x86_64'
 date='2020-06-18T18:42:09-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60340#comment:8>
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