anchor.diff:    pname = "gtk+3";
     version = "3.24.12";
   
  -  outputs = [ "out" "dev" "devdoc" ];
  +  outputs = [ "out" "dev" ] ++ optional withGtkDoc "devdoc";
     outputBin = "dev";
   
     setupHooks = [
  
positive.code:   separateDebugInfo = stdenv.isLinux;
  
    mesonFlags = [
      "-Dgtk_doc=true"
      "-Dtests=false"
    ];
  
  
negative.code: , wayland-protocols
  , xineramaSupport ? stdenv.isLinux
  , cupsSupport ? stdenv.isLinux
  , withGtkDoc ? stdenv.isLinux
  , cups ? null
  , AppKit
  , Cocoa
  