/usr/include/libktorrent/util/ is in libktorrent-dev 1.3.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libktorrent/util/array.h
/usr/include/libktorrent/util/autorotatelogjob.h
/usr/include/libktorrent/util/bitset.h
/usr/include/libktorrent/util/bufferpool.h
/usr/include/libktorrent/util/circularbuffer.h
/usr/include/libktorrent/util/compressfilejob.h
/usr/include/libktorrent/util/constants.h
/usr/include/libktorrent/util/decompressfilejob.h
/usr/include/libktorrent/util/error.h
/usr/include/libktorrent/util/extractfilejob.h
/usr/include/libktorrent/util/file.h
/usr/include/libktorrent/util/fileops.h
/usr/include/libktorrent/util/functions.h
/usr/include/libktorrent/util/log.h
/usr/include/libktorrent/util/logsystemmanager.h
/usr/include/libktorrent/util/pipe.h
/usr/include/libktorrent/util/ptrmap.h
/usr/include/libktorrent/util/resourcemanager.h
/usr/include/libktorrent/util/sha1hash.h
/usr/include/libktorrent/util/sha1hashgen.h
/usr/include/libktorrent/util/signalcatcher.h
/usr/include/libktorrent/util/timer.h
/usr/include/libktorrent/util/urlencoder.h
/usr/include/libktorrent/util/waitjob.h
/usr/include/libktorrent/util/win32.h