anchor.diff:    checkPhase = ''
       runHook preCheck
       NO_AT_BRIDGE=1 \
  +    XDG_DATA_DIRS=${folks}/share/gsettings-schemas/${folks.name} \
       xvfb-run -s '-screen 0 800x600x24' dbus-run-session \
         --config-file=${dbus.daemon}/share/dbus-1/session.conf \
         meson test --print-errorlogs
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "calls";
    version = "0.2.0";
  
    src = fetchFromGitLab {
      domain = "source.puri.sm";
      owner = "Librem5";
      repo = pname;
      rev = "v${version}";
      sha256 = "1qmjdhnr95dawccw1ss8hc3lk0cypj86xg2amjq7avzn86ryd76l";
    };
  
    nativeBuildInputs = [
  
negative.code:     ninja
      pkg-config
      desktop-file-utils
      appstream-glib
      vala
      wrapGAppsHook
    ];
  
  