/usr/lib/x86_64-linux-gnu/pkgconfig/lua53.pc is in liblua5.3-dev 5.3.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/pkgconfig/lua5.3.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/lua5.3.pc