[MacPorts] #60020: rtl-sdr @20191203-b5af355b: license is GPL-2, shouldn't it be GPL-2+ +/- LGPL-2.1+ ?

[MacPorts]

#60020: rtl-sdr @20191203-b5af355b: license is GPL-2, shouldn't it be GPL-2+ +/-
LGPL-2.1+ ?
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  Reporter:  tenzap   |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.2
Resolution:           |   Keywords:
      Port:  rtl-sdr  |
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Comment (by jmroot):

 All the source files say version 2 or any later version. (Except for
 tuner_fc2580.c, which worryingly says it came from somewhere else, citing
 a web page that no longer exists, but including no copyright or license
 information at all.) The CMakeLists.txt and other build system files
 aren't incorporated into the build products, and so aren't relevant for
 determining binary distributability.

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Ticket URL: <https://trac.macports.org/ticket/60020#comment:4>
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