[MacPorts] #61255: ruby @1.8.7-p374_10: eval.c:7288:2: error: implicit declaration of function 'rb_thread_join' is invalid in C99 [-Werror, -Wimplicit-function-declaration] (was: ruby fails to build)

[MacPorts]

#61255: ruby @1.8.7-p374_10: eval.c:7288:2: error: implicit declaration of function
'rb_thread_join' is invalid in C99 [-Werror,-Wimplicit-function-
declaration]
------------------------+----------------------
  Reporter:  hellhovnd  |      Owner:  kimuraw
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.3
Resolution:             |   Keywords:
      Port:  ruby       |
------------------------+----------------------
Changes (by kencu):

 * owner:  (none) => kimuraw
 * status:  new => assigned


Old description:



New description:

 ruby fails to build with Xcode 12.

 This would be approximately 1,780,902 ports with the same implicit
 declaration of function issue :>

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Ticket URL: <https://trac.macports.org/ticket/61255#comment:1>
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