/usr/lib/x86_64-linux-gnu/perl5/5.24/BerkeleyDB/Btree.pm is in libberkeleydb-perl 0.55-1+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | package BerkeleyDB::Btree ;
# This file is only used for MLDBM
use BerkeleyDB ;
1 ;
|