cannot figure out how to define that '“overwrite thing”.
Issuing sudo pacman -S nss --overwrite /usr/lib*/p11-kit-trust.so gives error:
warning: nss-3.51-1 is up to date -- reinstalling
error: target not found: /usr/lib/p11-kit-trust.so
warning: '/usr/lib/p11-kit-trust.so' is a file, did you mean -U/--upgrade instead of -S/--sync?