/usr/lib/ada/ is in libanet0.1-dev 0.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ada/adalib/
/usr/lib/ada/adalib/anet/
/usr/lib/ada/adalib/anet/anet-byte_swapping.ali
/usr/lib/ada/adalib/anet/anet-constants.ali
/usr/lib/ada/adalib/anet/anet-ipv4.ali
/usr/lib/ada/adalib/anet/anet-os.ali
/usr/lib/ada/adalib/anet/anet-sockets-filters.ali
/usr/lib/ada/adalib/anet/anet-sockets-tasking.ali
/usr/lib/ada/adalib/anet/anet-sockets-thin.ali
/usr/lib/ada/adalib/anet/anet-sockets.ali
/usr/lib/ada/adalib/anet/anet-streams.ali
/usr/lib/ada/adalib/anet/anet-udp.ali
/usr/lib/ada/adalib/anet/anet-util.ali
/usr/lib/ada/adalib/anet/anet.ali