Homebrew formula does not work on macOS Big Sur 11.1

[chiumichael]

Installing the dependencies through homebrew as indicated in the instructions in the main project page here doesn't work. I get the following error:

==> Installing includeos from includeos/includeos
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
Error: No available formula with the name "llvm@6" (dependency of includeos/includeos/includeos).
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.