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/usr/share/postgresql/9.5/extension/tsearch2.control is in postgresql-contrib-9.5 9.5.2-1.

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# tsearch2 extension
comment = 'compatibility package for pre-8.3 text search functions'
default_version = '1.0'
module_pathname = '$libdir/tsearch2'
# this is not relocatable because the tsearch2--unpackaged--1.0.sql script
# has to use @extschema@ to avoid conflict with items in pg_catalog
relocatable = false