Installing without rustup?

[palapapa]

I got a bunch of errors after running the installation script:

error[E0463]: can't find crate for `indexmap`
 --> rustowl-core/src/lib.rs:3:1
  |
3 | pub extern crate indexmap;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error[E0463]: can't find crate for `polonius_engine`
 --> rustowl-core/src/lib.rs:4:1
  |
4 | pub extern crate polonius_engine;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error[E0463]: can't find crate for `rustc_borrowck`
 --> rustowl-core/src/lib.rs:5:1
  |
5 | pub extern crate rustc_borrowck;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
  |
  = help: maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`

error[E0463]: can't find crate for `rustc_driver`
 --> rustowl-core/src/lib.rs:6:1
  |
6 | pub extern crate rustc_driver;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
  |
  = help: maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`

Does that mean I have to use rustup? I would rather use the rust package provided by Portage. Is there any way to add those crates without using rustup?

[cordx56]

If you can install the nightly-2024-10-31 toolchain, compiling and using RustOwl without rustup is possible.

However, I don’t know how to do it without rustup.