Install Rustc (Rust Compiler) Manually:
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Go to this web page:
https://forge.rust-lang.org/infra/other-installation-methods.html

And find the right file for your OS and ISA. Then you can download it. Here is an example wget download command:
wget https://static.rust-lang.org/dist/rust-1.75.0-powerpc64-unknown-linux-gnu.tar.gz
*The above is for Linux on BE PowerPC 64bit (like PowerMAC G5 or PS3).

extract the folder by:
tar -xvf rus*xz

Navagate into the folder by:
cd rus*gnu

Then run the install script (must be root) by:
sudo ./install.sh
*It can take a few minutes even with good hardware. It will state what sub program is being installed currently at least.

Then you should be all set! you can delete the new rustc* folder and installer by:
cd ..
sudo rm -r rustc*

Also check your rustc version by:
rustc --version

Source: https://forge.rust-lang.org/infra/other-installation-methods.html
Date: Early 2023 - Jan 2024