Files: inst/include/ankerl/unordered_dense.h
       inst/include/ankerl/stl.h
Copyright: 2022 Martin Leitner-Ankerl <martin.ankerl@gmail.com>
License: MIT
  https://github.com/martinus/unordered_dense/

Files: inst/include/ska_sort/ska_sort.hpp
Copyright: 2016 Malte Skarupke
License: BSL-1.0 (Boost Software License, Version 1.0)
  https://www.boost.org/LICENSE_1_0.txt

Files: inst/include/cppally/r_protect.h
Copyright: 2020 Posit Software, PBC
License: MIT
  SEXP protection mechanism inspired by cpp11::sexp
  https://github.com/r-lib/cpp11/