[MacPorts] #66488: lerc fails to build on Mountain Lion

[MacPorts]

#66488: lerc fails to build on Mountain Lion
---------------------+----------------------
  Reporter:  RobK88  |      Owner:  Veence
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.8.0
Resolution:          |   Keywords:
      Port:  lerc    |
---------------------+----------------------
Changes (by jmroot):

 * cc: vince@… (removed)
 * cc: dgilman, reneeotten (added)
 * keywords:  mountain-lion =>
 * status:  new => assigned
 * owner:  (none) => Veence


Comment:

 Fails to build on everything < 10.14, in fact. `std::greater` is very old
 so the compiler is unlikely to be the problem. A missing `#include
 <functional>` perhaps?

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Ticket URL: <https://trac.macports.org/ticket/66488#comment:2>
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