[MacPorts] #39248: rb ports need revbump

[MacPorts]

#39248: rb ports need revbump
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  Reporter:  ryandesign@…  |      Owner:  kimuraw@…
      Type:  defect        |     Status:  assigned
  Priority:  High          |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:
      Port:  ruby          |
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Comment (by jmr@…):

 This is worse than I thought. Gems that use rake won't build unless you
 specify `rake=rake-1.8` in the environment, since otherwise it uses the
 default_exec_format, which comes from ruby, and tries running `rake1.8`
 which doesn't exist.

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Ticket URL: <https://trac.macports.org/ticket/39248#comment:11>
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