/usr/ is in libluajit-5.1-dev 2.0.2+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/luajit5.1-deb-multiarch.h
/usr/include/luajit-2.0/
/usr/include/luajit-2.0/lua.h
/usr/include/luajit-2.0/lualib.h
/usr/include/luajit-2.0/luajit.h
/usr/include/luajit-2.0/lauxlib.h
/usr/include/luajit-2.0/luaconf.h
/usr/include/luajit-2.0/lua.hpp
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libluajit-5.1.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/luajit.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libluajit-5.1-dev/
/usr/share/doc/libluajit-5.1-dev/copyright
/usr/lib/x86_64-linux-gnu/libluajit-5.1.so
/usr/share/doc/libluajit-5.1-dev/changelog.Debian.gz