anchor.diff:  
       # Whether building a cross-compiler for GNU/Hurd.
       crossGNU = cross != null && cross.config == "i586-pc-gnu";
  -
  -    enableParallelBuilding = true;
   
       patches =
         [ ../use-source-date-epoch.patch ]
  
positive.code:   passthru =
      { inherit langC langCC langAda langFortran langVhdl langGo version; isGNU = true; };
  
    inherit enableParallelBuilding enableMultilib;
  
    inherit (stdenv) is64bit;
  
    meta = {
      homepage = http://gcc.gnu.org/;
  
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 ""}
  