[MacPorts] #71162: xar @1.8.0.501_0: error: implicit declaration of function 'xar_prop_get_expect_notnull' is invalid in C99 [-Werror, -Wimplicit-function-declaration]

[MacPorts]

#71162: xar @1.8.0.501_0: error: implicit declaration of function
'xar_prop_get_expect_notnull' is invalid in C99 [-Werror,-Wimplicit-
function-declaration]
-------------------------+------------------------------
  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  assigned
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:  2.10.2
Resolution:              |   Keywords:  bigsur, monterey
      Port:  xar         |
-------------------------+------------------------------

Comment (by VariantXYZ):

 I seem to be hitting the same issue while trying to install llvm-devel on
 15.2, I'm not very familiar with MacPorts but it seems to be the issue
 described in this ticket. Is there a workaround or fix I'm missing? I've
 attached my logs.

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Ticket URL: <https://trac.macports.org/ticket/71162#comment:21>
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