[ADMIN] pg_dump: [archiver (db)] query failed: ERROR: could not access file"$libdir/postgis-2.1": No such file or directory

I tried to do a pg_dump so that I can create the database on a intel platform where I have permissions.  When I do pg_dump it terminates with 

pg_dump: [archiver (db)] query failed: ERROR:  could not access file "$libdir/postgis-2.1": No such file or directory

pg_dump: [archiver (db)] query was: SELECT a.attnum, a.attname, a.atttypmod, a.attstattarget, a.attstorage, t.typstorage, a.attnotnull, a.atthasdef, a.attisdropped, a.attlen, a.attalign, a.attislocal, pg_catalog.format_type(t.oid,a.atttypmod) AS atttypname, array_to_string(a.attoptions, ', ') AS attoptions, CASE WHEN a.attcollation <> t.typcollation THEN a.attcollation ELSE 0 END AS attcollation, pg_catalog.array_to_string(ARRAY(SELECT pg_catalog.quote_ident(option_name) || ' ' || pg_catalog.quote_literal(option_value) FROM pg_catalog.pg_options_to_table(attfdwoptions) ORDER BY option_name), E',

    ') AS attfdwoptions FROM pg_catalog.pg_attribute a LEFT JOIN pg_catalog.pg_type t ON a.atttypid = t.oid WHERE a.attrelid = '6129600'::pg_catalog.oid AND a.attnum > 0::pg_catalog.int2 ORDER BY a.attrelid, a.attnum

 

all the object for postgis are in public but postgres doesn’t show the extension being installed.  How can I get around this problem so I dump this database?

Thanks