[MacPorts] #63018: Failed to build libgcc9 on Mac OS X 10.7.5

[MacPorts]

#63018: Failed to build libgcc9 on Mac OS X 10.7.5
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  Reporter:  YesNo801  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  libgcc9
      Port:  libgcc9   |
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Comment (by kencu):

 Ok, so I just built libgcc9 on my 10.7.5 system without any trouble.
 During the destroot phase, all the files are copied into the destroot just
 as you would expect them to be, it appears. But then somehow they are all
 deleted again (by the Portfile, I presume) and so in the end nothing is
 left in the destroot folder, and ergo the error here.

 So the question is -- why is everything being deleted from the destroot
 folder? I have a feeling I might know ... perhaps nothing from libgcc9 is
 actually needed?

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Ticket URL: <https://trac.macports.org/ticket/63018#comment:7>
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