/usr/include/ql/termstructures/volatility/swaption/ is in libquantlib0-dev 1.7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ql/termstructures/volatility/swaption/all.hpp
/usr/include/ql/termstructures/volatility/swaption/cmsmarket.hpp
/usr/include/ql/termstructures/volatility/swaption/cmsmarketcalibration.hpp
/usr/include/ql/termstructures/volatility/swaption/gaussian1dswaptionvolatility.hpp
/usr/include/ql/termstructures/volatility/swaption/spreadedswaptionvol.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionconstantvol.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvolcube.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvolcube1.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvolcube2.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvoldiscrete.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvolmatrix.hpp
/usr/include/ql/termstructures/volatility/swaption/swaptionvolstructure.hpp