/usr/include/gecode/int/cumulative/ is in libgecode-dev 5.1.0-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gecode/int/cumulative/edge-finding.hpp
/usr/include/gecode/int/cumulative/limits.hpp
/usr/include/gecode/int/cumulative/man-prop.hpp
/usr/include/gecode/int/cumulative/opt-prop.hpp
/usr/include/gecode/int/cumulative/overload.hpp
/usr/include/gecode/int/cumulative/post.hpp
/usr/include/gecode/int/cumulative/subsumption.hpp
/usr/include/gecode/int/cumulative/task-view.hpp
/usr/include/gecode/int/cumulative/task.hpp
/usr/include/gecode/int/cumulative/time-tabling.hpp
/usr/include/gecode/int/cumulative/tree.hpp
/usr/include/gecode/int/cumulatives/val.hpp