[MacPorts] #61883: Unable to install gcc6 in macOS Big Sur 11.1

[MacPorts]

#61883: Unable to install gcc6 in macOS Big Sur 11.1
------------------------+--------------------
  Reporter:  YuncongMa  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  libgcc7    |
------------------------+--------------------
Description changed by kencu:

Old description:

> Hi! I successfully installed MacPorts 2.6.4 in my Mac Pro 2019 with macOS
> Big Sur 11.1. I got errors when I tried "sudo port install gcc6". The
> error messages are as follows:
> --->  Fetching archive for libgcc7
> Warning: Your DNS servers incorrectly claim to know the address of
> nonexistent hosts. This may cause checksum mismatches for some ports. See
> this page for more information:
> <https://trac.macports.org/wiki/MisbehavingServers>
> --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
> https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7
> --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
> https://mse.uk.packages.macports.org/libgcc7
> --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
> https://lil.fr.packages.macports.org/libgcc7
> --->  Building libgcc7
> Error: Failed to build libgcc7: command execution failed
> Error: See
> /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log
> for details.
> Error: Follow https://guide.macports.org/#project.tickets to report a
> bug.
> Error: Processing of port gcc6 failed

New description:

 Hi! I successfully installed MacPorts 2.6.4 in my Mac Pro 2019 with macOS
 Big Sur 11.1. I got errors when I tried "sudo port install gcc6". The
 error messages are as follows:
 {{{
 --->  Fetching archive for libgcc7
 Warning: Your DNS servers incorrectly claim to know the address of
 nonexistent hosts. This may cause checksum mismatches for some ports. See
 this page for more information:
 <https://trac.macports.org/wiki/MisbehavingServers>
 --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
 https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7
 --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
 https://mse.uk.packages.macports.org/libgcc7
 --->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from
 https://lil.fr.packages.macports.org/libgcc7
 --->  Building libgcc7
 Error: Failed to build libgcc7: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 Error: Processing of port gcc6 failed
 }}}

--

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Ticket URL: <https://trac.macports.org/ticket/61883#comment:3>
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