[MacPorts] #59319: gcc8 fails to build (macOS 10.15 Catalina)

[MacPorts]

#59319: gcc8 fails to build (macOS 10.15 Catalina)
------------------------+--------------------
  Reporter:  smeingast  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.1
Resolution:             |   Keywords:
      Port:  gcc8       |
------------------------+--------------------
Description changed by ryandesign:

Old description:

> Just tried and failed to build gcc8 on macOS Catalina. When first trying
> to install gcc8, I ran into an issue with libunwind-headers, so I
> followed some advice here [https://trac.macports.org/ticket/57198] and
> uninstalled.the component via
>

> {{{
> sudo port uninstall libunwind-headers
> }}}
>
> Then the installation proceeded beyond the first failure, but did not
> complete. Log is attached

New description:

 Just tried and failed to build gcc8 on macOS Catalina. When first trying
 to install gcc8, I ran into an issue with libunwind-headers, so I followed
 some advice [ticket:57198 here] and uninstalled.the component via


 {{{
 sudo port uninstall libunwind-headers
 }}}

 Then the installation proceeded beyond the first failure, but did not
 complete. Log is attached

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Ticket URL: <https://trac.macports.org/ticket/59319#comment:2>
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