[MacPorts] #55756: sixs 2.1: new port for 6SV2.1

[MacPorts]

#55756: sixs 2.1: new port for 6SV2.1
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  Reporter:  ForTozs     |      Owner:  (none)
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  sixs        |
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Comment (by mf2k):

 Looking at other ports that use the compilers portgroup, some variant of
 the following is needed:

 {{{
 compilers.setup         require_fortran
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55756#comment:8>
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