/usr/include/GraphUnidraw/ is in ivtools-dev 1.2.11a1-11.
This file is owned by root:root, with mode 0o755.
..
/usr/include/GraphUnidraw/edgecomp.h
/usr/include/GraphUnidraw/graphcatalog.h
/usr/include/GraphUnidraw/graphclasses.h
/usr/include/GraphUnidraw/graphcmds.h
/usr/include/GraphUnidraw/graphcomp.h
/usr/include/GraphUnidraw/graphcreator.h
/usr/include/GraphUnidraw/graphdata.h
/usr/include/GraphUnidraw/graphdialog.h
/usr/include/GraphUnidraw/grapheditor.h
/usr/include/GraphUnidraw/graphexport.h
/usr/include/GraphUnidraw/graphimport.h
/usr/include/GraphUnidraw/graphkit.h
/usr/include/GraphUnidraw/graphtools.h
/usr/include/GraphUnidraw/nodecomp.h