/usr/share/postgres-xc/extension/pg_freespacemap.control is in postgres-xc-contrib 1.1-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # pg_freespacemap extension
comment = 'examine the free space map (FSM)'
default_version = '1.0'
module_pathname = '$libdir/pg_freespacemap'
relocatable = true
|