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/usr/share/postgresql/10/extension/pltcl--unpackaged--1.0.sql is in postgresql-pltcl-10 10.3-1.

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/* src/pl/tcl/pltcl--unpackaged--1.0.sql */

ALTER EXTENSION pltcl ADD PROCEDURAL LANGUAGE pltcl;
-- ALTER ADD LANGUAGE doesn't pick up the support functions, so we have to.
ALTER EXTENSION pltcl ADD FUNCTION pltcl_call_handler();