anchor.diff:  
     outputs = [ "out" "man" ];
     preFixup = ''
  -    mkdir -p "$man/man/man1"
  -    cp target/release/build/git-ignore-*/out/git-ignore.1 "$man/man/man1/"
  +    installManPage $releaseDir/build/git-ignore-*/out/git-ignore.1
     '';
   
     meta = with stdenv.lib; {
  
positive.code: { stdenv, fetchFromGitHub, rustPlatform, pkgconfig, openssl, darwin }:
  
  with rustPlatform;
  
  
negative.code: 
    cargoSha256 = "0vcg2pl0s329fr8p23pwdx2jy7qahbr7n337ib61f69aaxi1xmq0";
  
    nativeBuildInputs = [ pkgconfig installShellFiles ];
    buildInputs = [ openssl ]
    ++ stdenv.lib.optionals stdenv.isDarwin [
      darwin.apple_sdk.frameworks.Security
  