anchor.diff:  { lib, stdenv, fetchFromGitHub, cmake, ninja
  +, fetchpatch
   , secureBuild ? false
   }:
   
  
positive.code:     homepage    = "https://github.com/microsoft/mimalloc";
      license     = licenses.bsd2;
      platforms   = platforms.unix;
      maintainers = with maintainers; [ thoughtpolice ];
    };
  }
  
negative.code:   in ''
      # first, move headers and cmake files, that's easy
      mkdir -p $dev/lib
      mv $out/lib/cmake $dev/lib/
  
      find $dev $out -type f
    '' + (lib.optionalString secureBuild ''
      # pretend we're normal mimalloc
      ln -sfv $out/lib/libmimalloc-secure${suffix} $out/lib/libmimalloc${suffix}
  