[MacPorts] #55733: lz4 @1.8.1.2: fails to build on systems following LibcxxOnOlderSystems

[MacPorts]

#55733: lz4 @1.8.1.2: fails to build on systems following LibcxxOnOlderSystems
-------------------------+------------------------
  Reporter:  grumpybozo  |      Owner:  ryandesign
      Type:  defect      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  lz4         |
-------------------------+------------------------

Comment (by kencu):

 As this issue is really 10.5 specific, would you be open to a PR that
 disables building the manual only on 10.5?

 {{{
 platform darwin 9 {
     build.target allmost
 }
 }}}
 should do it.

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Ticket URL: <https://trac.macports.org/ticket/55733#comment:9>
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