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/usr/share/postgresql/9.4/extension/plproxy--2.5.0.sql is in postgresql-9.4-plproxy 2.5-5.

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-- handler function
CREATE FUNCTION plproxy_call_handler ()
RETURNS language_handler AS 'plproxy' LANGUAGE C;

-- language
CREATE LANGUAGE plproxy HANDLER plproxy_call_handler;

-- validator function
CREATE FUNCTION plproxy_fdw_validator (text[], oid)
RETURNS boolean AS 'plproxy' LANGUAGE C;

-- foreign data wrapper
CREATE FOREIGN DATA WRAPPER plproxy VALIDATOR plproxy_fdw_validator;