[MacPorts] #54124: guile @2.2.2 won't build on PPC Leopard, Mac OS X 10.5.8, because is uses non-existing /lib/cpp as C preprocessor

[MacPorts]

#54124: guile @2.2.2 won't build on PPC Leopard, Mac OS X 10.5.8, because is uses
non-existing /lib/cpp as C preprocessor
------------------------+---------------------------------------
  Reporter:  ballapete  |      Owner:  kencu
      Type:  defect     |     Status:  reopened
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:             |   Keywords:  tiger leopard snowleopard
      Port:  guile      |
------------------------+---------------------------------------

Comment (by kencu):

 {{{
 $ port -v installed guile
 The following ports are currently installed:
   guile @2.0.14_2 platform='darwin 9' archs='ppc'
 date='2020-06-26T23:04:25-0700'
   guile @2.9.1_0 (active) platform='darwin 9' archs='ppc'
 date='2020-09-03T18:43:56-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54124#comment:39>
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