/usr/include/gecode/int/view/ is in libgecode-dev 5.1.0-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gecode/int/view-val-graph/bi-link.hpp
/usr/include/gecode/int/view-val-graph/comb-ptr-flag.hpp
/usr/include/gecode/int/view-val-graph/edge.hpp
/usr/include/gecode/int/view-val-graph/graph.hpp
/usr/include/gecode/int/view-val-graph/iter-prune-val.hpp
/usr/include/gecode/int/view-val-graph/node.hpp
/usr/include/gecode/int/view/bool-test.hpp
/usr/include/gecode/int/view/bool.hpp
/usr/include/gecode/int/view/cached.hpp
/usr/include/gecode/int/view/constint.hpp
/usr/include/gecode/int/view/int.hpp
/usr/include/gecode/int/view/iter.hpp
/usr/include/gecode/int/view/minus.hpp
/usr/include/gecode/int/view/neg-bool.hpp
/usr/include/gecode/int/view/offset.hpp
/usr/include/gecode/int/view/print.hpp
/usr/include/gecode/int/view/rel-test.hpp
/usr/include/gecode/int/view/scale.hpp
/usr/include/gecode/int/view/zero.hpp