How to use it? Or what we've done? For using it, you can try nix-build 'channel:nixpkgs-unstable' -A pkgsCross.x86_64-netbsd.libcpuid nix-build 'channel:

How to use it? Or what we've done? For using it, you can try nix-build 'channel:nixpkgs-unstable' -A pkgsCross.x86_64-netbsd.libcpuid nix-build 'channel:nixpkgs-unstable' -A pkgsCross.x86_64-freebsd.libcpuid For the gory details, check out https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/bsd/netbsd/default.nix https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specifi... and https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/bsd/freebsd/default.nix https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specifi...