anchor.diff:      homepage = "https://gitlab.com/mdds/mdds";
       description = "A collection of multi-dimensional data structure and indexing algorithm";
       platforms = platforms.all;
  -    broken = stdenv.isDarwin;
       license = licenses.mit;
     };
   }
  
positive.code:     cp "$out/share/pkgconfig/"* "$out/lib/pkgconfig"
    '';
  
    checkInputs = [ boost ];
  
    meta = with stdenv.lib; {
  
negative.code: { stdenv, fetchurl, boost, llvmPackages }:
  
  stdenv.mkDerivation rec {
    pname = "mdds";
  