anchor.diff:  
     mesonFlags = [
       "-Dgtk_doc=true"
  +    "-Dvapi=true"
     ] ++ lib.optionals stdenv.isDarwin [
       # mremap does not exist on darwin
       "-Dmmap-buffer-backend=false"
  
positive.code:     pkg-config
      gi-docgen
      gobject-introspection
      wrapGAppsHook4
    ];
  
  
negative.code: , glib
  , atk
  , gobject-introspection
  , vala
  , wrapGAppsHook4
  }:
  
  stdenv.mkDerivation rec {
    pname = "ghex";
    version = "43.rc";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/ghex/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "yGQ+fwmzNkEqj39swLZU2NmysL5cA2W+jYkTHBU9M/M=";
    };
  
    nativeBuildInputs = [
  