anchor.diff:  
     postPatch = ''
       substituteInPlace mk/c.mk \
  -        --replace "-Werror" ""
  +      --replace "-Werror" ""
     '';
   
     buildPhase = ''
  -    make bootstrap
  -    make
  +    make bootstrap -j$NIX_BUILD_CORES
  +    make -j$NIX_BUILD_CORES
     '';
   
     postInstall = ''
       for b in $out/bin/*; do
  -        wrapProgram $b --prefix PATH : $out/bin:${lib.makeBinPath [ binutils ]}
  +      wrapProgram $b --prefix PATH : $out/bin:${lib.makeBinPath [ binutils ]}
       done
     '';
   
  
positive.code:   doCheck = true;
  
    meta = with lib; {
      # darwin: never built on Hydra https://hydra.nixos.org/job/nixpkgs/trunk/myrddin.x86_64-darwin
      broken = (stdenv.isLinux && stdenv.isAarch64) || stdenv.isDarwin;
      description = "Systems language that is both powerful and fun to use";
      homepage = "https://myrlang.org/";
      license = licenses.mit;
      maintainers = with maintainers; [ luc65r ];
      platforms = platforms.all;
    };
  }
  
negative.code: , pkg-config
  , bison
  , binutils
  , makeWrapper
  }:
  
  