anchor.diff:    installPhase = ''
       install -D -m755 buck-out/gen/*/programs/buck.pex $out/bin/buck
       wrapProgram $out/bin/buck \
  -      --prefix PATH : "${lib.makeBinPath [ jdk11 watchman python3 ]}"
  +      --prefix PATH : "${lib.makeBinPath [ jdk8 watchman python3 ]}"
     '';
   
     meta = with lib; {
  
positive.code: { lib, stdenv, fetchFromGitHub, jdk11, ant, python3, watchman, bash, makeWrapper }:
  
  stdenv.mkDerivation rec {
    pname = "buck";
  
negative.code:     grep -l -r '/bin/bash' --null | xargs -0 sed -i -e "s!/bin/bash!${bash}/bin/bash!g"
    '';
  
    nativeBuildInputs = [ makeWrapper python3 jdk8 ant watchman ];
  
    buildPhase = ''
      # Set correct version, see https://github.com/facebook/buck/issues/2607
  