[MacPorts] #60706: xxhash: license BSD isn't entirely correct

[MacPorts]

#60706: xxhash: license BSD isn't entirely correct
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  Schamschula
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  xxhash
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 The xxhash port says it is under the BSD license but that's not completely
 accurate. The xxhash library is BSD licensed but the xxhsum program is
 under GPL-2+.

 https://github.com/Cyan4973/xxHash/blob/dev/LICENSE

 Modifying the port to specify that it is under both licenses would be bad
 because that could prevent ports linking with the library from being
 distributable (see e.g. #60704).

 How about splitting the xxhsum files out into their own xxhsum subport?
 That way you can properly indicate the license of both xxhash and xxhsum.

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Ticket URL: <https://trac.macports.org/ticket/60706>
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