/usr/include/gecode/gist/ is in libgecode-dev 5.1.0-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gecode/gist/drawingcursor.hh
/usr/include/gecode/gist/drawingcursor.hpp
/usr/include/gecode/gist/gecodelogo.hh
/usr/include/gecode/gist/gist.hpp
/usr/include/gecode/gist/layoutcursor.hh
/usr/include/gecode/gist/layoutcursor.hpp
/usr/include/gecode/gist/mainwindow.hh
/usr/include/gecode/gist/node.hh
/usr/include/gecode/gist/node.hpp
/usr/include/gecode/gist/nodecursor.hh
/usr/include/gecode/gist/nodecursor.hpp
/usr/include/gecode/gist/nodestats.hh
/usr/include/gecode/gist/nodevisitor.hh
/usr/include/gecode/gist/nodevisitor.hpp
/usr/include/gecode/gist/nodewidget.hh
/usr/include/gecode/gist/preferences.hh
/usr/include/gecode/gist/qtgist.hh
/usr/include/gecode/gist/spacenode.hh
/usr/include/gecode/gist/spacenode.hpp
/usr/include/gecode/gist/stopbrancher.hh
/usr/include/gecode/gist/textoutput.hh
/usr/include/gecode/gist/treecanvas.hh
/usr/include/gecode/gist/visualnode.hh
/usr/include/gecode/gist/visualnode.hpp
/usr/include/gecode/gist/zoomToFitIcon.hpp