anchor.diff:    pname = "umockdev";
     version = "0.15.4";
   
  -  outputs = [ "bin" "out" "dev" "doc" ];
  +  outputs = [ "bin" "out" "dev" "devdoc" ];
   
     src = fetchurl {
       url = "https://github.com/martinpitt/umockdev/releases/download/${version}/${pname}-${version}.tar.xz";
  
positive.code: { lib, stdenv
  , docbook_xsl
  , fetchurl
  , fetchpatch
  , glib
  
negative.code:     vala
    ];
  
    buildInputs = [
      glib
      systemd
      libgudev
    ];
  
    checkInputs = [
      python3
      which
      usbutils
    ];
  
    mesonFlags = [
      "-Dgtk_doc=true"
    ];
  
    doCheck = true;
  
    meta = with lib; {
      description = "Mock hardware devices for creating unit tests";
      license = licenses.lgpl21Plus;
      maintainers = with maintainers; [ flokli ];
      platforms = with platforms; linux;
    };
  