/usr/include/ql/methods/finitedifferences/utilities/ is in libquantlib0-dev 1.4-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ql/methods/finitedifferences/utilities/all.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmaffinemodelswapinnervalue.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmaffinemodeltermstructure.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmboundaryconditionset.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmdirichletboundary.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmdividendhandler.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmindicesonboundary.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdminnervaluecalculator.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmquantohelper.hpp
/usr/include/ql/methods/finitedifferences/utilities/fdmtimedepdirichletboundary.hpp