[MacPorts] #61632: mpack: build fails under macOS 11.0.1

[MacPorts]

#61632: mpack: build fails under macOS 11.0.1
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 Reporter:  arrigo  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.4
 Keywords:          |       Port:  mpack
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 The `mpack` port fails to build under macOS 11.0.1 with various errors,
 mostly relating to missing declarations. Log is too large to add here so
 am enclosing as an attachment.
 Similarly to the the torsocks build failure, ticket [ticket:61631], it
 appears that in macOS 11.0.1 the compiler is using strict C99 syntax
 checks so all implicit declarations are now errors.

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Ticket URL: <https://trac.macports.org/ticket/61632>
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