/usr/ is in libmath-vector-real-xs-perl 0.10-1build3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.26/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Math/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Math/Vector/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Math/Vector/Real/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Math/Vector/Real/XS.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Math/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Math/Vector/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Math/Vector/Real/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Math/Vector/Real/XS/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Math/Vector/Real/XS/XS.so
/usr/share/
/usr/share/doc/
/usr/share/doc/libmath-vector-real-xs-perl/
/usr/share/doc/libmath-vector-real-xs-perl/changelog.Debian.gz
/usr/share/doc/libmath-vector-real-xs-perl/copyright
/usr/share/man/
/usr/share/man/man3/
/usr/share/man/man3/Math::Vector::Real::XS.3pm.gz