anchor.diff:  { lib
   , dbus
   , fetchFromGitHub
  -, libssh
   , openssl
   , pkg-config
   , rustPlatform
  
positive.code:     Foundation
      Security
    ];
  
    NIX_CFLAGS_COMPILE = lib.optionals stdenv.isDarwin [
      "-framework" "AppKit"
  
negative.code: 
    buildInputs = [
      dbus
      openssl
    ] ++ lib.optionals stdenv.isDarwin [
      AppKit
  