[MacPorts] #61890: tclx @8.4.1_0 - Build failure - panic implicit declaration causes error

[MacPorts]

#61890: tclx @8.4.1_0 - Build failure - panic implicit declaration causes error
-----------------------+--------------------
 Reporter:  lmhaffner  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:  bigsur     |       Port:  tclx
-----------------------+--------------------
 tclx fails to build on macOS 11.x and XCode 12.3 with the new "implicit
 declaration" warning being elevated to a compiler error.

 Example line from the log (attached):

 {{{
 ./generic/tclXfcntl.c:214:9: error: implicit declaration of function
 'panic' is invalid in C99 [-Werror,-Wimplicit-funct
 ion-declaration]
      panic ("bug in fcntl get attrib");
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61890>
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