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/usr/share/postgresql/9.5/extension/pltclu.control is in postgresql-pltcl-9.5 9.5.2-1.

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