[MacPorts] #59660: py36-isce2 fails to rebuild with Xcode 11.2

[MacPorts]

#59660: py36-isce2 fails to rebuild with Xcode 11.2
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  Reporter:  EJFielding  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  py36-isce2  |
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Comment (by piyushrpt):

 The error seems to suggest that HDF5 was not found - this might be because
 it was built with a different compiler.
 We are working on getting isce2 to compile with clang. It works with clang
 and gfortran from gcc7. Needs couple of fixes to work with gfortran from
 gcc9 - and then the recommended way to be to just use clang for everything
 on the new macs.

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Ticket URL: <https://trac.macports.org/ticket/59660#comment:3>
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