anchor.diff:    ] ++ optional withGUI qt5.qtbase;
   
     preConfigure = "./autogen.sh; patchShebangs .";
  -  buildPhase   = "./drake -j $NIX_BUILD_CORES";
  -  installPhase = "./drake install -j $NIX_BUILD_CORES";
  +  buildPhase   = "drake -j $NIX_BUILD_CORES";
  +  installPhase = "drake install -j $NIX_BUILD_CORES";
   
     configureFlags = [
       "--enable-magic"
  
positive.code:     "--disable-profiling"
      "--disable-precompiled-headers"
      "--disable-static-qt"
      "--without-curl"
      "--with-gettext"
      (enableFeature withGUI "qt")
    ];
  
negative.code: { stdenv, fetchFromGitHub, pkgconfig, autoconf, automake
  , drake, ruby, file, xdg_utils, gettext, expat, qt5, boost
  , libebml, zlib, libmatroska, libogg, libvorbis, flac
  , withGUI ? true
  }:
  