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

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

/*
 * Currently, all the interesting stuff is done by CREATE LANGUAGE.
 * Later we will probably "dumb down" that command and put more of the
 * knowledge into this script.
 */

CREATE PROCEDURAL LANGUAGE pltcl;

COMMENT ON PROCEDURAL LANGUAGE pltcl IS 'PL/Tcl procedural language';