warning: /build/gitui/src/gitui-0.20.1/Cargo.toml: `rust-version` is not supported on this version of Cargo and will be ignored

this Cargo does not support nightly features, but if you
switch to nightly channel you can add
`cargo-features = ["rust-version"]` to enable this feature
    Updating crates.io index
error: process didn't exit successfully: `rustc -vV` (exit status: 127)
--- stderr
/usr/bin/rustc: error while loading shared libraries: libLLVM-12.so: cannot open shared object file: No such file or directory

==> ERROR: A failure occurred in prepare().
    Aborting...