anchor.diff:        withCpu +
         withAbi +
         withFpu +
  +      withFloat +
         (if (crossMingw && crossStageStatic) then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
  
positive.code:     gccCpu = stdenv.lib.attrByPath [ "gcc" "cpu" ] null cross;
      gccAbi = stdenv.lib.attrByPath [ "gcc" "abi" ] null cross;
      gccFpu = stdenv.lib.attrByPath [ "gcc" "fpu" ] null cross;
      withArch = if gccArch != null then " --with-arch=${gccArch}" else "";
      withCpu = if gccCpu != null then " --with-cpu=${gccCpu}" else "";
      withAbi = if gccAbi != null then " --with-abi=${gccAbi}" else "";
      withFpu = if gccFpu != null then " --with-fpu=${gccFpu}" else "";
      crossMingw = (cross != null && cross.libc == "msvcrt");
  
      crossConfigureFlags =
  
negative.code:     xgccCpu = stdenv.lib.attrByPath [ "gcc" "cpu" ] null stdenv.cross;
      xgccAbi = stdenv.lib.attrByPath [ "gcc" "abi" ] null stdenv.cross;
      xgccFpu = stdenv.lib.attrByPath [ "gcc" "fpu" ] null stdenv.cross;
      xgccFloat = stdenv.lib.attrByPath [ "gcc" "float" ] null stdenv.cross;
      xwithArch = if xgccArch != null then " --with-arch=${xgccArch}" else "";
      xwithCpu = if xgccCpu != null then " --with-cpu=${xgccCpu}" else "";
      xwithAbi = if xgccAbi != null then " --with-abi=${xgccAbi}" else "";
      xwithFpu = if xgccFpu != null then " --with-fpu=${xgccFpu}" else "";
      xwithFloat = if xgccFpu != null then " --with-float=${xgccFloat}" else "";
    in {
      AR = "${stdenv.cross.config}-ar";
      LD = "${stdenv.cross.config}-ld";
  