/usr/include/ is in libmapserver-dev 7.0.0-9ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mapserver/
/usr/include/mapserver/mapraster.h
/usr/include/mapserver/maphttp.h
/usr/include/mapserver/maperror.h
/usr/include/mapserver/maphash.h
/usr/include/mapserver/mapogcfilter.h
/usr/include/mapserver/maptree.h
/usr/include/mapserver/mapshape.h
/usr/include/mapserver/cgiutil.h
/usr/include/mapserver/mapwcs.h
/usr/include/mapserver/mapparser.h
/usr/include/mapserver/mapfile.h
/usr/include/mapserver/mapsymbol.h
/usr/include/mapserver/mapproject.h
/usr/include/mapserver/mapkmlrenderer.h
/usr/include/mapserver/mapows.h
/usr/include/mapserver/mapregex.h
/usr/include/mapserver/mappostgis.h
/usr/include/mapserver/mapserver-version.h
/usr/include/mapserver/mapogcsld.h
/usr/include/mapserver/dejavu-sans-condensed.h
/usr/include/mapserver/mapcopy.h
/usr/include/mapserver/mapserver.h
/usr/include/mapserver/mapagg.h
/usr/include/mapserver/hittest.h
/usr/include/mapserver/mapresample.h
/usr/include/mapserver/mapprimitive.h
/usr/include/mapserver/uthash.h
/usr/include/mapserver/maptemplate.h
/usr/include/mapserver/mapio.h
/usr/include/mapserver/mapoglcontext.h
/usr/include/mapserver/maplibxml2.h
/usr/include/mapserver/mapserver-config.h
/usr/include/mapserver/maputfgrid.h
/usr/include/mapserver/mapowscommon.h
/usr/include/mapserver/mapthread.h
/usr/include/mapserver/fontcache.h
/usr/include/mapserver/mapentities.h
/usr/include/mapserver/mapgml.h
/usr/include/mapserver/mapaxisorder.h
/usr/include/mapserver/mapserver-api.h
/usr/include/mapserver/maptile.h
/usr/include/mapserver/maptime.h
/usr/include/mapserver/mapserv.h
/usr/include/mapserver/mapoglrenderer.h
/usr/include/mapserver/dxfcolor.h