[MacPorts] #71151: xar @1.8.0.498: error: use of undeclared identifier 'XAR_CKSUM_SHA256', 'XAR_CKSUM_SHA512'

[MacPorts]

#71151: xar @1.8.0.498: error: use of undeclared identifier 'XAR_CKSUM_SHA256',
'XAR_CKSUM_SHA512'
-------------------------+-------------------------------------------------
  Reporter:  0xbf00      |      Owner:  Schamschula
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.2
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  xar         |  mountainlion mavericks
-------------------------+-------------------------------------------------

Comment (by Schamschula):

 I did add the old patch as {{{patch-src-xar_internal.h.old.diff}}}
 specifically to support older OS versions.

 Looking at the build bot output: It seems to ignore the {{{if}}}
 statements and pick up the incorrect version number and patch file.

 On further investigation: Big Sur and Monterey have a different issue;
 Implicit function declarations. I will have to fix those separately.

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Ticket URL: <https://trac.macports.org/ticket/71151#comment:3>
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