[MacPorts] #71699: harfbuzz @10.1.0_2+universal: ninja: error: unknown target 'CFLAGS+=-arch x86_64'

[MacPorts]

#71699: harfbuzz @10.1.0_2+universal: ninja: error: unknown target 'CFLAGS+=-arch
x86_64'
------------------------------+-------------------------------
  Reporter:  thetrial         |      Owner:  mascguy
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.10.5
Resolution:                   |   Keywords:  legacy-os, sierra
      Port:  harfbuzz, ninja  |
------------------------------+-------------------------------

Comment (by cgilles):

 I can reproduce the dysfunction today from a fresh macports install

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Ticket URL: <https://trac.macports.org/ticket/71699#comment:18>
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