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/usr/share/postgresql/9.3/extension/pltcl.control is in postgresql-pltcl-9.3 9.3.24-0ubuntu0.14.04.

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# pltcl extension
comment = 'PL/Tcl procedural language'
default_version = '1.0'
module_pathname = '$libdir/pltcl'
relocatable = false
schema = pg_catalog
superuser = false