/usr/include/boost/qvm/gen/ is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/qvm/gen/mat_assign2.hpp
/usr/include/boost/qvm/gen/mat_assign3.hpp
/usr/include/boost/qvm/gen/mat_assign4.hpp
/usr/include/boost/qvm/gen/mat_operations2.hpp
/usr/include/boost/qvm/gen/mat_operations3.hpp
/usr/include/boost/qvm/gen/mat_operations4.hpp
/usr/include/boost/qvm/gen/swizzle2.hpp
/usr/include/boost/qvm/gen/swizzle3.hpp
/usr/include/boost/qvm/gen/swizzle4.hpp
/usr/include/boost/qvm/gen/vec_assign2.hpp
/usr/include/boost/qvm/gen/vec_assign3.hpp
/usr/include/boost/qvm/gen/vec_assign4.hpp
/usr/include/boost/qvm/gen/vec_mat_operations2.hpp
/usr/include/boost/qvm/gen/vec_mat_operations3.hpp
/usr/include/boost/qvm/gen/vec_mat_operations4.hpp
/usr/include/boost/qvm/gen/vec_operations2.hpp
/usr/include/boost/qvm/gen/vec_operations3.hpp
/usr/include/boost/qvm/gen/vec_operations4.hpp