[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]

[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]
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  Reporter:  hellhovnd  |      Owner:  kimuraw
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.3
Resolution:             |   Keywords:
      Port:  ruby       |
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Comment (by chrstphrchvz):

 Never mind, `rb_thread_join()` is being used before but in the same file
 as its definition.

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Ticket URL: <https://trac.macports.org/ticket/61255#comment:4>
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