[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+ ?
--------------------+-----------------------
 Reporter:  tenzap  |      Owner:  michaelld
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.2
 Keywords:          |       Port:  rtl-sdr
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 Dear maintainer,

 I noticed rtl-sdr's Portfile mentions license is GPL-2.

 This is blocking the distribution of welle.io as a binary package.
 {{{"welle.io-devel" is not distributable because its license "GPL-3+"
 conflicts with license "GPL-2" of dependency "rtl-sdr"}}}.

 I had quick look at the license and it seems it uses code licensed under
 GPL-2+ LGPL-2.1+ GPL-3+.

 At least that is what is mentionned in the [[https://metadata.ftp-
 master.debian.org/changelogs/main/r/rtl-sdr/unstable_copyright|copyright
 file of debian]].

 Do you think it is possible to change the license mentionned in the
 portfile of rtl-sdr accordingly ?

 BTW, there are other elements about the licenses and welle.io in #59779.

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