/usr/include/liblas/detail/ is in liblas-dev 1.2.1-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/liblas/detail/endian.hpp
/usr/include/liblas/detail/file.hpp
/usr/include/liblas/detail/fwd.hpp
/usr/include/liblas/detail/reader.hpp
/usr/include/liblas/detail/reader10.hpp
/usr/include/liblas/detail/reader11.hpp
/usr/include/liblas/detail/reader12.hpp
/usr/include/liblas/detail/sha1.hpp
/usr/include/liblas/detail/sharedptr.hpp
/usr/include/liblas/detail/timer.hpp
/usr/include/liblas/detail/utility.hpp
/usr/include/liblas/detail/writer.hpp
/usr/include/liblas/detail/writer10.hpp
/usr/include/liblas/detail/writer11.hpp
/usr/include/liblas/detail/writer12.hpp