[MacPorts] #59207: perl5.28 build fails on Catalina with MacPorts 2.6.1 and Xcode 11.1

[MacPorts]

#59207: perl5.28 build fails on Catalina with MacPorts 2.6.1 and Xcode 11.1
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  Reporter:  nombak    |      Owner:  mojca
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  perl5.28  |
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Comment (by paxperscientiam):

 just noting that `perl5.28` also failed to build for me on Catalina.
 Fortunately, disabling parallel building worked for me as well. For
 posterity, here is the command I used: `sudo port install perl5.28
 use_parallel_build=no`. According to docs, this should work also: `sudo
 port install PORT build.jobs=1`

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Ticket URL: <https://trac.macports.org/ticket/59207#comment:12>
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