anchor.diff: -{ stdenv, fetchFromGitHub, fetchurl, which, llvmPackages, ncurses, lua }:
  +{ stdenv, fetchFromGitHub, fetchurl, llvmPackages, ncurses, lua }:
   
   let
     luajitArchive = "LuaJIT-2.0.4.tar.gz";
  
positive.code:     paxmark m $bin/bin/terra
    '';
  
    buildInputs = with llvmPackages; [ which lua llvm clang-unwrapped ncurses ];
  
    meta = with stdenv.lib; {
      inherit (src.meta) homepage;
  
negative.code:   '';
  
    preBuild = ''
      cat >Makefile.inc<<EOF
      CLANG = ${stdenv.lib.getBin llvmPackages.clang-unwrapped}/bin/clang
      LLVM_CONFIG = ${stdenv.lib.getBin llvmPackages.llvm}/bin/llvm-config
      EOF
  
      mkdir -p build
      cp ${luajitSrc} build/${luajitArchive}
    '';
  