Opam-nix override stdenv [nix-0008]

/startverb
pkgs = import nixpkgs {
  inherit system;
  config.replaceStdenv = { pkgs }: if pkgs.stdenv.isDarwin then pkgs.overrideSDK pkgs.stdenv "11.0" else pkgs.stdenv;
};
...
scope = on.buildOpamProject' { repos = [ "${opam-repository}" ]; inherit pkgs; } ./. query;
/stopverb

这里有一个完整的 example