anchor.diff:    passthru =
       { inherit langC langCC langAda langFortran langVhdl langGo version; isGNU = true; };
   
  -  inherit enableParallelBuilding enableMultilib;
  -
  -  inherit (stdenv) is64bit;
  +  inherit enableMultilib;
   
     meta = {
       homepage = http://gcc.gnu.org/;
  
positive.code: 
      # Whether building a cross-compiler for GNU/Hurd.
      crossGNU = cross != null && cross.config == "i586-pc-gnu";
  
      enableParallelBuilding = true;
  
      patches =
        [ ../use-source-date-epoch.patch ]
  
negative.code:       then " --with-native-system-header-dir=${stdenv.libc}/include"
        else ""}
      ${if langAda then " --enable-libada" else ""}
      ${if stdenv.lib.elem stdenv.targetSystem stdenv.lib.platforms.i686 then "--with-arch=i686" else ""}
      ${if cross != null then crossConfigureFlags else ""}
      ${if !bootstrap then "--disable-bootstrap" else ""}
      ${if cross == null then platformFlags else ""}
  