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/usr/share/postgresql/9.5/extension/plperlu--unpackaged--1.0.sql is in postgresql-plperl-9.5 9.5.2-1.

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/* src/pl/plperl/plperlu--unpackaged--1.0.sql */

ALTER EXTENSION plperlu ADD PROCEDURAL LANGUAGE plperlu;
-- ALTER ADD LANGUAGE doesn't pick up the support functions, so we have to.
ALTER EXTENSION plperlu ADD FUNCTION plperlu_call_handler();
ALTER EXTENSION plperlu ADD FUNCTION plperlu_inline_handler(internal);
ALTER EXTENSION plperlu ADD FUNCTION plperlu_validator(oid);