[MacPorts] #64551: freeciv @2.6.6: X11 config tests gives -Wimplicit-function-declaration warning on exit, strcmp

[MacPorts]

#64551: freeciv @2.6.6: X11 config tests gives -Wimplicit-function-declaration
warning on exit, strcmp
----------------------+----------------------
  Reporter:  JDLH     |      Owner:  JDLH
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  freeciv  |
----------------------+----------------------

Comment (by JDLH):

 The Freeciv project fixed this bug upstream in their S2_6, S3_0, S3_1, and
 master branches. We will see the fix in the 2.6.7 and 3.0 releases.
 However, for 2.6.6, I will patch m4/x.m4 and m4/vsnprint.m4 .

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Ticket URL: <https://trac.macports.org/ticket/64551#comment:3>
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