[MacPorts] #63748: xsel 1.2.0 fails to build on macOS 12.0.1

[MacPorts]

#63748: xsel 1.2.0 fails to build on macOS 12.0.1
---------------------------+------------------------
  Reporter:  derekschrock  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  monterey
      Port:  xsel          |
---------------------------+------------------------

Comment (by ryandesign):

 However the last release of xsel was in 2008 so it may be dead. If anyone
 knows the fix for this issue, please contribute it to upstream, then
 notify us here.

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Ticket URL: <https://trac.macports.org/ticket/63748#comment:3>
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