/usr/include/simgear/nasal/ is in libsimgear-dev 3.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/simgear/nasal/cppbind/
/usr/include/simgear/nasal/cppbind/Ghost.hxx
/usr/include/simgear/nasal/cppbind/NasalCallContext.hxx
/usr/include/simgear/nasal/cppbind/NasalHash.hxx
/usr/include/simgear/nasal/cppbind/NasalObjectHolder.hxx
/usr/include/simgear/nasal/cppbind/NasalString.hxx
/usr/include/simgear/nasal/cppbind/detail/
/usr/include/simgear/nasal/cppbind/detail/from_nasal_function_templates.hxx
/usr/include/simgear/nasal/cppbind/detail/from_nasal_helper.hxx
/usr/include/simgear/nasal/cppbind/detail/functor_templates.hxx
/usr/include/simgear/nasal/cppbind/detail/nasal_traits.hxx
/usr/include/simgear/nasal/cppbind/detail/to_nasal_helper.hxx
/usr/include/simgear/nasal/cppbind/from_nasal.hxx
/usr/include/simgear/nasal/cppbind/to_nasal.hxx
/usr/include/simgear/nasal/naref.h
/usr/include/simgear/nasal/nasal.h