/usr/share/postgresql/9.1/extension/plperl--unpackaged--1.0.sql is in postgresql-plperl-9.1 9.1.13-1.
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 | /* src/pl/plperl/plperl--unpackaged--1.0.sql */
ALTER EXTENSION plperl ADD PROCEDURAL LANGUAGE plperl;
-- ALTER ADD LANGUAGE doesn't pick up the support functions, so we have to.
ALTER EXTENSION plperl ADD FUNCTION plperl_call_handler();
ALTER EXTENSION plperl ADD FUNCTION plperl_inline_handler(internal);
ALTER EXTENSION plperl ADD FUNCTION plperl_validator(oid);
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