[MacPorts] #38570: lua-lpeg @0.11: portfile fails to parse during selfupdate

[MacPorts]

#38570: lua-lpeg @0.11: portfile fails to parse during selfupdate
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  Reporter:  egall@…   |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.1.3
Resolution:            |   Keywords:
      Port:  lua-lpeg  |
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Comment (by egall@…):

 installing lua makes this error go away, but I shouldn't have to install
 lua just to `selfupdate`

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Ticket URL: <https://trac.macports.org/ticket/38570#comment:1>
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