anchor.diff:  , fetchFromGitHub
   , rustPlatform
   , installShellFiles
  -, libiconv
   , cmake
   , fetchpatch
   , nixosTests
  
positive.code:       --zsh <($out/bin/starship completions zsh)
    '';
  
    cargoSha256 = "sha256-Q1VY9RyHEsQAWRN/upeG5XJxJfrmzj5FQG6GBGrN0xU=";
  
    preCheck = ''
      HOME=$TMPDIR
  
negative.code:     owner = "starship";
      repo = pname;
      rev = "v${version}";
      hash = "sha256-90mh8C52uD68K5o1LE22gkbL1gy6FyMJTiiN9oV/3DE=";
    };
  
    nativeBuildInputs = [ installShellFiles cmake ];
  
    buildInputs = lib.optionals stdenv.isDarwin [ Security Foundation Cocoa ];
  
    NIX_LDFLAGS = lib.optionals (stdenv.isDarwin && stdenv.isx86_64) [ "-framework" "AppKit" ];
  
    postInstall = ''
      installShellCompletion --cmd starship \
  