/usr/lib/rpm/fileattrs/perllib.attr is in rpm 4.14.1+dfsg1-2.
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 | %__perllib_provides %{_rpmconfigdir}/perl.prov
%__perllib_requires %{_rpmconfigdir}/perl.req
%__perllib_magic ^Perl[[:digit:]] module source.*
%__perllib_path \\.pm$
%__perllib_flags magic_and_path
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