anchor.diff:    mesonFlags = [
       "-Dnautilus=false"
       "-Dps=enabled"
  +  ] ++ lib.optionals (!withLibsecret) [
  +    "-Dkeyring=disabled"
     ];
   
     NIX_CFLAGS_COMPILE = "-I${glib.dev}/include/gio-unix-2.0";
  
positive.code: , libgxps
  , supportXPS ? true # Open XML Paper Specification via libgxps
  , withPantheon ? false
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     libarchive
      libhandy
      librsvg
      libspectre
      libxml2
      pango
      poppler
      t1lib
      texlive.bin.core # kpathsea for DVI support
    ] ++ lib.optionals withLibsecret [
      libsecret
    ] ++ lib.optionals supportXPS [
      libgxps
    ] ++ lib.optionals supportMultimedia (with gst_all_1; [
  