[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):

 The build on PPC Leopard, Mac OS X 10.5.8 is finished. The TEXI file was
 built although the pre-built GO files were accessible, just as in Tiger.
 It took a bit more than four hours! Is new `libffi` the culprit?

 I am going to continue `rev-upgrade` – it just happened that `port` wanted
 to upgrade `Guile` and so I decided to perform this by myself. (The test
 with the offset of a long failed.) After this I'll try to rebuild `Guile`
 again.

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Ticket URL: <https://trac.macports.org/ticket/54124#comment:76>
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