[MacPorts] #56043: libemos @2.4.2 cannot install the port

[MacPorts]

#56043: libemos @2.4.2 cannot install the port
-------------------------+----------------------
  Reporter:  david-pino  |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  libemos     |
-------------------------+----------------------

Comment (by kencu):

 That's great. Now to figure out how to automate this so nobody else will
 have this issue...perhaps, as libemos has a default of +gcc7, we should
 set that up to `require_activate_variants +gcc7` in `fftw-3`...

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Ticket URL: <https://trac.macports.org/ticket/56043#comment:7>
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