anchor.diff:      profiledCompiler = false;
       enableMultilib = true;
       crossStageStatic = false;
  -    cross = crossSystem;
  +    cross = assert crossSystem != null; crossSystem;
     };
   
     gcc44_realCross = makeOverridable (import ../development/compilers/gcc-4.4) {
  
positive.code:     # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41818
      enableShared = if (crossSystem.arch == "sparc64") then false else true;
      crossStageStatic = false;
      cross = crossSystem;
    };
  
    gccCrossStageStatic = wrapGCCCross {
  
negative.code:     });
      libc = null;
      binutils = binutilsCross;
      cross = assert crossSystem != null; crossSystem;
    };
  
    gccCrossStageFinal = wrapGCCCross {
      gcc = forceBuildDrv gcc44_realCross;
      libc = libcCross;
      binutils = binutilsCross;
      cross = assert crossSystem != null; crossSystem;
    };
  
    gcc43_multi = lowPrio (wrapGCCWith (import ../build-support/gcc-wrapper) glibc_multi (gcc43.gcc.override {
  