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