[MacPorts] #60347: p5.28-socket6 @0.290.0: error: use of undeclared identifier 'sv_undef'

[MacPorts]

#60347: p5.28-socket6 @0.290.0: error: use of undeclared identifier 'sv_undef'
----------------------------+--------------------
  Reporter:  SerpentChris   |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:
      Port:  p5.28-socket6  |
----------------------------+--------------------

Comment (by tgyurci):

 I've run this issue too.  I suspect that this port's build is broken
 because of the Xcode upgrade, because it has been build successfully some
 time earlier (I don't remember the exact time, sorry).

 Versions:
 {{{
 DEBUG: macOS 10.15 (darwin/19.6.0) arch i386
 DEBUG: MacPorts 2.6.4
 DEBUG: Xcode 12.4
 DEBUG: SDK 10.15
 DEBUG: MACOSX_DEPLOYMENT_TARGET: 10.15
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60347#comment:5>
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