Unable to install gcc6 in macOS Big Sur 11.1

[YuncongMa (Yuncong Ma)]

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

[kencu (Ken)]

Welcome!

Regarding your connection issue, try opening this URL in a browser and see what happens <​https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7/>

If that works fine, try downloading a file from that url with curl and see what what happens

curl -O https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7/libgcc7-7.5.0_0.darwin_19.x86_64.tbz2

The full details on how to debug this are here wiki:MisbehavingServers.

FYI -- gcc7/libgcc7 is quite old, and may not work / be able to be made to work on BigSur.

The current gcc flavour for you would be gcc10 -- will that work for you?

sudo port -v install gcc10