[MacPorts] #62183: ruby30 @3.0.0: error: use of undeclared identifier 'fmt'; did you mean 'fma'?

[MacPorts]

#62183: ruby30 @3.0.0: error: use of undeclared identifier 'fmt'; did you mean
'fma'?
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  Reporter:  simon-dedeo  |      Owner:  kimuraw
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:  sierra
      Port:  ruby30       |
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Comment (by simon-dedeo):

 Thank you Ryan; I'm doing the Xcode/Xcode command line tools update now,
 and I'll let you know what happens. Downstream from the successful compile
 I had some weird behaviors from ruby30 itself (i.e., when running it), so
 it wasn't a successful install, just one that didn't crash at install
 time.

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Ticket URL: <https://trac.macports.org/ticket/62183#comment:5>
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