anchor.diff:  
     glibc = glibc217;
   
  -  glibcCross = glibc213Cross;
  +  glibcCross = glibc217Cross;
   
     glibc213 = (callPackage ../development/libraries/glibc/2.13 {
       kernelHeaders = linuxHeaders;
  
positive.code:     gccCross = null;
    }) // (if crossSystem != null then { crossDrv = glibc213Cross; } else {});
  
    glibc213Cross = forceNativeDrv (makeOverridable (import ../development/libraries/glibc/2.13)
      (let crossGNU = crossSystem != null && crossSystem.config == "i586-pc-gnu";
       in {
         inherit stdenv fetchurl;
  
negative.code:         inherit fetchgit;
        }));
  
  
    # We can choose:
    libcCrossChooser = name : if name == "glibc" then glibcCross
  