[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:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:  fixed      |   Keywords:  tiger leopard snowleopard
      Port:  guile      |
------------------------+---------------------------------------

Comment (by ballapete):

 I already built `Guile 2.2.7` with the Tiger per-built GO files, some
 hours ago it worked to build `Guile` with the GO files built on Leopard.
 Again the bootstrap step went fast, a few hours instead of a few days.
 Next try with the previously in a day-long process bootstrapped GO files
 failed early when the TEXI files was to be built. Now a build with the
 original (per-built) files has started – which failed, just as before,
 when trying to build the TEXI file. So it should be clear now that the new
 version of `libffi` has no effect, the pre-built 32-bit big-endian GO
 files are inadequate for PowerPC and Mac OS X.

 The new try is to bootstrap on Leopard and then use these GO files instead
 of the broken pre-built GO files in order to sort out whether Leopard
 simply cannot build valid pre-built GO files, with old and new version of
 `libffi`.

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Ticket URL: <https://trac.macports.org/ticket/54124#comment:77>
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