[MacPorts] #64335: fftw-3 configure error on 10.5.8 for ppc64 when using external gcc10

[MacPorts]

#64335: fftw-3 configure error on 10.5.8 for ppc64 when using external gcc10
---------------------------+-------------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  PowerPC, Leopard, ppc64
      Port:  fftw-3        |
---------------------------+-------------------------------------

Comment (by barracuda156):

 Replying to [comment:1 ryandesign]:
 > Please attach the config.log so that we can see why that configure test
 failed.

 It looks that it just ignored and used gcc7 instead.

 But @kencu strongly advised against using external compiler in Macports:
 https://github.com/iains/gcc-10-branch/issues/4#issuecomment-1008157050
 So I guess I rather wait until someone either fixes Macports gcc7 so that
 it starts building ppc64 or implements @iains fixes of gcc10 for PowerPC
 from here: https://github.com/iains/gcc-10-branch/tree/gcc-10-3-ppc (this
 branch builds on PowerPC and produces both pcc and ppc64 binaries on
 10.5.8).

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Ticket URL: <https://trac.macports.org/ticket/64335#comment:2>
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