[MacPorts] #62463: ispc-clang :build fails on BigSur: error: invalid application of 'sizeof' to an incomplete type 'struct stat64'

[MacPorts]

#62463: ispc-clang :build fails on BigSur: error: invalid application of 'sizeof'
to an incomplete type 'struct stat64'
-------------------------+----------------------
  Reporter:  sampotter   |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ispc-clang  |
-------------------------+----------------------

Comment (by gallafent):

 Just to note, this breakage prevents blender from being installed on macOS
 11 at the moment, so I'm looking forward to the fix!

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Ticket URL: <https://trac.macports.org/ticket/62463#comment:6>
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