Answer by Jon C for Anchor build fails due to a current Rust version (1.59 or above is needed, 1.67 is installed)

The Solana CLI tools come bundled with a rustc compiler that can be used for on-chain programs. Since you're on 1.9.5, you have a much older version of the bundled Rust compiler.

Please upgrade to something newer, at least the version targeted by Anchor 0.26.0, which is 1.13.5, by running:

$ solana-install init 1.13.5