Why there is no `rust-std-x86_64-pc-windows-gnu` package?

[XhstormR]

What if I don't have the MS MSVC toolchain and want to use the mingw64 toolchain for building?

I see that Rustbook offers an x86_64-pc-windows-gnu version for download.
https://forge.rust-lang.org/infra/other-installation-methods.html#standalone-installers

https://packages.fedoraproject.org/pkgs/rust/rust-std-static-x86_64-pc-windows-gnu/