[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
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  Reporter:  grumpybozo  |      Owner:  ryandesign
      Type:  defect      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  lz4         |
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Comment (by ryandesign):

 Looking at this further, I don't know why it fails for you, so I'd
 appreciate it if you would attach the complete main.log file showing the
 failure.

 The assumption that this software requires C++11 appears to be incorrect.
 C++ is only used to build the `gen_manual` program, which is only used to
 generate the manual. It builds fine with libstdc++ on Leopard with g++-4.2
 which does not support C++11. In fact it builds on every macOS version we
 automatically build on (10.5–10.8 with libstdc++, 10.9–10.13 with libc++).

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Ticket URL: <https://trac.macports.org/ticket/55733#comment:5>
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