https://static.rust-lang.org/dist/rustc-1.40.0-src.tar.gz
https://static.rust-lang.org/dist/2019-11-07/rust-std-1.39.0-x86_64-unknown-linux-musl.tar.gz?no-extract
https://static.rust-lang.org/dist/2019-11-07/rustc-1.39.0-x86_64-unknown-linux-musl.tar.gz?no-extract
https://static.rust-lang.org/dist/2019-11-07/cargo-0.40.0-x86_64-unknown-linux-musl.tar.gz?no-extract
patches/musl-libressl.patch