[MacPorts] #50671: boost: Update to 1.60.0

[MacPorts]

#50671: boost: Update to 1.60.0
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  Reporter:  eborisch@…  |      Owner:  ryandesign@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  haspatch
      Port:  boost       |
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Comment (by mmoll@…):

 Ports that depend on Boost.Python may not compile. I tried ompl (a port I
 maintain) with Boost 1.60 and it definitely doesn't compile. See, e.g.,
 https://bitbucket.org/ompl/ompl/issues/210/compilation-failure-with-
 boost-1600 and https://github.com/hhatto/pgmagick/issues/4

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:3>
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