anchor.diff:  
     # outputs TODO: share/gobject-introspection-1.0/tests is needed during build
     # by pygobject3 (and maybe others), but it's only searched in $out
  -  outputs = [ "out" "dev" "man" ];
  +  outputs = [ "out" "dev" "devdoc" "man" ];
     outputBin = "dev";
   
     src = fetchurl {
  
positive.code:     meson
      ninja
      pkg-config
    ];
  
    buildInputs = [
  
negative.code:     "--datadir=${placeholder "dev"}/share"
      "-Ddoctool=disabled"
      "-Dcairo=disabled"
      "-Dgtk_doc=true"
    ];
  
    doCheck = !stdenv.isAarch64;
  