anchor.diff:  , fetchpatch
   , ninja
   , meson
  -, pkgconfig
  +, pkg-config
   , gobject-introspection
   , gtk-doc
  -, docbook_xsl
  +, docbook-xsl-nons
   , docbook_xml_dtd_43
   , glib
   , gtk3
  
positive.code:     owner = "alexlarsson";
      repo = "gthree";
      rev = version;
      sha256 = "16ap1ampnzsyhrs84b168d6889lh8sjr2j5sqv9mdbnnhy72p5cd";
    };
  
    nativeBuildInputs = [
      ninja
      meson
      pkgconfig
      gtk-doc
      docbook_xsl
      docbook_xml_dtd_43
      gobject-introspection
    ];
  
    buildInputs = [
      epoxy
    ];
  
    propagatedBuildInputs = [
      glib
      gtk3
      graphene
      json-glib
    ];
  
    mesonFlags = [
      "-Dgtk_doc=${if stdenv.isDarwin then "false" else "true"}"
    ];
  
    meta = with stdenv.lib; {
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gthree";
    version = "0.9.0";
  
    outputs = [ "out" "dev" "devdoc" ];
  
  