Check path in Makefile

> make

> sudo make install

> psql
# CREATE FUNCTION bsdconv(text, text) RETURNS text AS 'bsdconv', 'Bsdconv' LANGUAGE C STRICT;
# select bsdconv('utf-8:upper:full:utf-8','test');
 bsdconv  
----------
 ＴＥＳＴ
(1 row)
# DROP FUNCTION IF EXISTS bsdconv(text, text);