anchor.diff:  
   stdenv.mkDerivation rec {
   
  -  version = "0.12.0";
  +  version = "0.13.0";
   
     meta = with stdenv.lib; {
       homepage = "https://github.com/bazelbuild/bazel/";
  
positive.code:         --replace /bin/bash ${customBash}/bin/bash \
          --replace /usr/bin/env ${coreutils}/bin/env
      done
      echo "build --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\"" >> .bazelrc
      echo "build --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\"" >> .bazelrc
      echo "build --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\"" >> .bazelrc
      echo "build --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\"" >> .bazelrc
      sed -i -e "348 a --copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --copt=\"/g')\" \\\\" scripts/bootstrap/compile.sh
      sed -i -e "348 a --host_copt=\"$(echo $NIX_CFLAGS_COMPILE | sed -e 's/ /" --host_copt=\"/g')\" \\\\" scripts/bootstrap/compile.sh
      sed -i -e "348 a --linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --linkopt=\"-Wl,/g')\" \\\\" scripts/bootstrap/compile.sh
      sed -i -e "348 a --host_linkopt=\"-Wl,$(echo $NIX_LDFLAGS | sed -e 's/ /" --host_linkopt=\"-Wl,/g')\" \\\\" scripts/bootstrap/compile.sh
      patchShebangs .
    '';
  
  
negative.code: 
    src = fetchurl {
      url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
      sha256 = "143nd9dmw2x88azf8spinl2qnvw9m8lqlqc765l9q2v6hi807sc2";
    };
  
    sourceRoot = ".";
  