/usr/lib/x86_64-linux-gnu/ is in libnet-z3950-simpleserver-perl 1.15-1build3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Net/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Net/Z3950/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Net/Z3950/GRS1.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Net/Z3950/OID.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Net/Z3950/SimpleServer.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Net/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Net/Z3950/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Net/Z3950/SimpleServer/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Net/Z3950/SimpleServer/SimpleServer.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Net/Z3950/SimpleServer/autosplit.ix