anchor.diff:      sha256 = "10n9qk1dild9yjkjjkzpmp9zid3ysdgvqrad554azcf755frch7g";
     };
   
  -  buildInputs = [ python llvm clang ];
  +  buildInputs = [ python2 llvm clang ];
   
     postPatch = ''
       sed -i 's,llvm_clang =.*,llvm_clang = "${clang}/bin/clang",' configure.py
  
positive.code:   '';
  
    configurePhase = ''
      python2 ./configure.py --prefix=$out
    '';
  
    meta = with stdenv.lib; {
  
negative.code: { stdenv, fetchFromGitHub, python2, llvm, clang }:
  
  stdenv.mkDerivation {
    name = "libclc-2015-08-07";
  