[MacPorts] #70685: screen @5.0.0_0: invalid value 'c17' in '-std=c17'

[MacPorts]

#70685: screen @5.0.0_0: invalid value 'c17' in '-std=c17'
-------------------------------+----------------------
 Reporter:  thetrial           |      Owner:  dgilman
     Type:  defect             |     Status:  assigned
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:  2.10.1
 Keywords:  legacy-os, sierra  |       Port:  screen
-------------------------------+----------------------
 Today’s notification:

 {{{
 :info:build error: invalid value 'c17' in '-std=c17'
 :info:build make: *** [winmsgcond.o] Error 1
 }}}

 Tried to build under macOS 10.12.6.

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Ticket URL: <https://trac.macports.org/ticket/70685>
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