[MacPorts] #56922: Libgcc7 @7.3.0_1 fails to build on PPC Tiger, Mac OS X 10.4.11, because comparison of stages 2 and 3 fails

[MacPorts]

#56922: Libgcc7 @7.3.0_1 fails to build on PPC Tiger, Mac OS X 10.4.11, because
comparison of stages 2 and 3 fails
------------------------+--------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:             |   Keywords:  tiger
      Port:  libgcc7    |
------------------------+--------------------

Comment (by ballapete):

 Replying to [comment:67 kencu]:
 > right. probably. we don't know about the `gpl3` part, as nobody else has
 likely tried to build gcc7 with that version of the compiler. but probably
 not the compiler.
 >
 > now why were `ld64` and `cctools` not installed? that is another
 question, and I'm not sure how that could happen.
 >
 Look at comment 48 from yourself! I deactivated these two packages on your
 recommendation in order to be able to build the `+bootstrap` variants.

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Ticket URL: <https://trac.macports.org/ticket/56922#comment:68>
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