anchor.diff:    postInstall = ''
       wrapProgram $bin/bin/fac \
         --prefix PATH : ${git}/bin
  +
  +    install -D ${fac_1} $out/share/man/man1/fac.1
     '';
   
     meta = with stdenv.lib; {
  
positive.code: { stdenv, buildGoPackage, fetchFromGitHub, makeWrapper, git }:
  
  buildGoPackage rec {
    name = "fac-${version}";
    version = "1.0.1";
  
    goPackagePath = "github.com/mkchoi212/fac";
  
  
negative.code:     owner = "mkchoi212";
      repo = "fac";
      rev = "v${version}";
      sha256 = "0jhx80jbkxfxj95hmdpb9wwwya064xpfkaa218l1lwm3qwfbpk95";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  