anchor.diff:    '';
   
     configurePhase = ''
  -    ${python.interpreter} ./configure.py --prefix=$out
  +    ${python3.interpreter} ./configure.py --prefix=$out
     '';
   
     enableParallelBuilding = true;
  
positive.code: { lib, stdenv, fetchFromGitHub, python, llvmPackages }:
  
  let
    llvm = llvmPackages.llvm;
  
negative.code:     sha256 = "03l9frx3iw3qdsb9rrscgzdwm6872gv6mkssvn027ndf9y321xk7";
    };
  
    nativeBuildInputs = [ python3 llvm ];
  
    strictDeps = true;
  
    postPatch = ''
      sed -i 's,llvm_clang =.*,llvm_clang = "${clang-unwrapped}/bin/clang",' configure.py
  