Updating crates.io index
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names --target riscv64-unknown-linux-gnu --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit status: 1)
  --- stderr
  error: Error loading target specification: Could not find specification for target "riscv64-unknown-linux-gnu". Run `rustc --print target-list` for a list of built-in targets

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