anchor.diff:  
       rm -rf $out/var
       rm -rf $siteVersionDir
  +
  +    nuke-refs $out/libexec/emacs/*/*/emacs.pdmp
  +
     '' + lib.optionalString withCsrc ''
       for srcdir in src lisp lwlib ; do
         dstdir=$siteVersionDir/$srcdir
  
positive.code: , libtiff, librsvg, gconf, libxml2, imagemagick, gnutls, libselinux
  , alsaLib, cairo, acl, gpm, AppKit, GSS, ImageIO, m17n_lib, libotf
  , jansson, harfbuzz
  , libgccjit, targetPlatform, makeWrapper # native-comp params
  , systemd ? null
  , withX ? !stdenv.isDarwin
  , withNS ? stdenv.isDarwin
  
negative.code: 
    LIBRARY_PATH = if nativeComp then "${lib.getLib stdenv.cc.libc}/lib" else "";
  
    nativeBuildInputs = [ pkgconfig makeWrapper nukeReferences ]
      ++ lib.optionals srcRepo [ autoreconfHook texinfo ]
      ++ lib.optional (withX && (withGTK3 || withXwidgets)) wrapGAppsHook;
  
  