/usr/lib/x86_64-linux-gnu/ is in kea-dev 1.1.0-1build2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/dns++.pc
/usr/lib/x86_64-linux-gnu/libkea-asiodns.so
/usr/lib/x86_64-linux-gnu/libkea-asiolink.so
/usr/lib/x86_64-linux-gnu/libkea-cc.so
/usr/lib/x86_64-linux-gnu/libkea-cfgclient.so
/usr/lib/x86_64-linux-gnu/libkea-cryptolink.so
/usr/lib/x86_64-linux-gnu/libkea-dhcp++.so
/usr/lib/x86_64-linux-gnu/libkea-dhcp_ddns.so
/usr/lib/x86_64-linux-gnu/libkea-dhcpsrv.so
/usr/lib/x86_64-linux-gnu/libkea-dns++.so
/usr/lib/x86_64-linux-gnu/libkea-eval.so
/usr/lib/x86_64-linux-gnu/libkea-exceptions.so
/usr/lib/x86_64-linux-gnu/libkea-hooks.so
/usr/lib/x86_64-linux-gnu/libkea-log.so
/usr/lib/x86_64-linux-gnu/libkea-stats.so
/usr/lib/x86_64-linux-gnu/libkea-threads.so
/usr/lib/x86_64-linux-gnu/libkea-util-io.so
/usr/lib/x86_64-linux-gnu/libkea-util.so