=# \dx
                 List of installed extensions
  Name   | Version |   Schema   |         Description          
---------+---------+------------+------------------------------
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(1 row)

-# \df  levenshtein*
                           List of functions
 Schema |    Name     | Result data type | Argument data types |  Type  
--------+-------------+------------------+---------------------+--------
 public | levenshtein | integer          | text, text          | normal
(1 row)


The server is in localhost. The binaries are from enterpriseDB. I also
downloaded src code for Postgres 9.1.11. Recompiled fuzzystrmatch, which
includes levenstein less_equal. Replaced .so file in Postgres installation
dir. Change in levenshtein limit of character successful. 

It is not a compilation error, because I do not get  levenstein less_equal
in the Postgres 9.2 server which is exactly as  downloaded from
EnterpriseDB.



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