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/usr/share/postgresql/10/extension/earthdistance.control is in postgresql-10 10.6-0ubuntu0.18.04.1.

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# earthdistance extension
comment = 'calculate great-circle distances on the surface of the Earth'
default_version = '1.1'
module_pathname = '$libdir/earthdistance'
relocatable = true
requires = 'cube'