[MacPorts] #61858: libunistring: build fails due to failing configure checks

[MacPorts]

#61858: libunistring: build fails due to failing configure checks
---------------------------+----------------------
  Reporter:  chhil         |      Owner:  ci42
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:
      Port:  libunistring  |
---------------------------+----------------------

Comment (by chhil):

 > Including both arm and i386 versions of the headers isn't going to work
 very well, naturally.

 Could you guide me or provide pointers on how to get to building for the
 right architecture on my M1? I assume it needs to be arm only.
 I did try changing build_arch in the macports.conf to amd64 and got the
 same errors.

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Ticket URL: <https://trac.macports.org/ticket/61858#comment:5>
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