[MacPorts] #58653: Some portfiles fail to parse under linux

[MacPorts]

#58653: Some portfiles fail to parse under linux
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  Reporter:  mojca                               |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  botan chicken fpc gnuradio macos-   |
  vpn-server mlt octave psi py-eric-ide qt4-mac  |
  texworks wireshark22                           |
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Comment (by RJVB):

 Yes, IIRC `os.major` resolves to the kernel major version on Linux, i.e.
 probably mostly 4 nowadays. That's mostly a problem once you actually
 start using MacPorts on Linux; with a few exceptions there is no link
 between kernel version and userland (libraries) from the pov. of ports.

 As a general principle ports should throw errors only in the pre-fetch
 phase; this also helps prevent issues during `portindex`.

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Ticket URL: <https://trac.macports.org/ticket/58653#comment:13>
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