[MacPorts] #64167: R-app does not build for PowerPC 10.5.8

[MacPorts]

#64167: R-app does not build for PowerPC 10.5.8
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  Reporter:  barracuda156  |      Owner:  i0ntempest
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  R-app         |
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Comment (by barracuda156):

 Replying to [comment:2 reneeotten]:
 > as the message states presumable the port will only build on 'x86_64
 arm64'; the {{{supported_arch}}} setting was added based on
 [ticket:38917]. If you know how to fix this, please feel free to submit a
 PR - otherwise I don't think there is much we can do about it.

 I can assure you that R 4.1.2 builds on PowerPC in 32 bit, and also R GUI
 (R.app) builds from Xcode project up to version 1.67 with appropriate
 changes to Project settings in 32 bits. Starting from R GUI v. 1.70 there
 are some changes to xib files, which fail on PowerPC, though I have been
 able to build 1.72 with replacing xibs from 1.67.

 To sum up, the latest R.app 1.76 won't build. However earlier ones do
 build and can be linked to the latest R build via Macports.

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Ticket URL: <https://trac.macports.org/ticket/64167#comment:3>
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