cargo-c : Helper program to build and install c-like libraries ( https://github.com/lu-zero/cargo-c )
maturin : Build and publish crates with pyo3, rust-cpython and cffi bindings ( https://www.maturin.rs/ )
rustup : Rust toolchain installer ( https://rust-lang.github.io/rustup/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a libressl
For Paludis use this rsync : rsync://gentoo.zugaina.org/libressl-portage
If you have a problem : ycarus(-at-)zugaina.org