/usr/ is in libmapcache1-dev 1.6.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/mapcache/
/usr/include/mapcache/errors.h
/usr/include/mapcache/ezxml.h
/usr/include/mapcache/mapcache-cgi-config.h
/usr/include/mapcache/mapcache-config.h
/usr/include/mapcache/mapcache-util-config.h
/usr/include/mapcache/mapcache-version.h
/usr/include/mapcache/mapcache.h
/usr/include/mapcache/mapcache_services.h
/usr/include/mapcache/mod_mapcache-config.h
/usr/include/mapcache/util.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/share/
/usr/share/doc/
/usr/share/doc/libmapcache1-dev/
/usr/share/doc/libmapcache1-dev/copyright
/usr/lib/x86_64-linux-gnu/libmapcache.so
/usr/share/doc/libmapcache1-dev/changelog.Debian.gz