[MacPorts] #60896: cmake @3.18.0_1: Unable to find MacPorts zlib

[MacPorts]

#60896: cmake @3.18.0_1: Unable to find MacPorts zlib
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  Reporter:  jasonliu--     |      Owner:  michaelld
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:
      Port:  cmake openvdb  |
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Comment (by jasonliu--):

 I have also tested it, and can confirm that adding the ZLIB_ROOT fixes the
 openvdb port on my macOS 10.11 + Xcode 8.2 machine.

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Ticket URL: <https://trac.macports.org/ticket/60896#comment:5>
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