[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'
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  Reporter:  SerpentChris   |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:
      Port:  p5.28-socket6  |
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Comment (by saagarjha):

 I ran into this issue recently because some of the Xcode updates doing
 some funny things with how their organized their SDKs, which was causing
 the configure step to think there was no PL_sv_undef (check config.log)
 because it was passing the wrong arguments there. Those came from stale
 flags when building perl5.28 with an old Xcode that I was no longer using,
 so in my case I uninstalled and reinstalled that (to get what I'm guessing
 is some sort of makefile template to use the right paths) and then the
 p5.28-socket6 installed cleanly. Just my 2¢; YMMV.

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Ticket URL: <https://trac.macports.org/ticket/60347#comment:3>
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