[MacPorts] #69604: ruby-build fails with fatal error: 'yaml.h' file not found

[MacPorts]

#69604: ruby-build fails with fatal error: 'yaml.h' file not found
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  Reporter:  breun       |      Owner:  mojca
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ruby-build  |
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Comment (by breun):

 It looks like `ruby-build` added auto-detection support for Homebrew's
 `libyaml` last year: https://github.com/rbenv/ruby-
 build/releases/tag/v20230306 Maybe `ruby-build` also needs a MacPorts
 version of this feature?

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Ticket URL: <https://trac.macports.org/ticket/69604#comment:4>
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