[unixODBC][Driver Manager] Can't open lib '/usr/local/lib/libtdsodbc.so' : file not found (SQL-01000)

Hi,

I've got a:
 
[unixODBC][Driver Manager] Can't open lib '/usr/local/lib/libtdsodbc.so' : file 
not found (SQL-01000)
 
on executing a Perl script (that works without any problem on a TEST 
environement) even though the file is present:
 
lrwxrwxrwx    1 root     root           19  Nov 14 
17:02 /usr/local/lib/libtdsodbc.so -> libtdsodbc.so.0.0.0
-rwxr-xr-x    1 root     root       777051 Nov 16 
16:41 /usr/local/lib/libtdsodbc.so.0.0.0
 
Some hints:
 
1) freeTDS   successfully installed and tsql responsive (executes "SELECT * 
FROM customer WHERE customer = ..."  )
2) unixODBC successfully installed and isql  responsive (executes "SELECT * 
FROM customer WHERE customer = ..."  )
3) DBD-ODBC installed but with a number of failed tests and warning of older 
versions:
Warning: prerequisite DBI 1.609 not found. We have 1.59.
Warning: prerequisite Test::Simple 0.9 not found. We have 0.62.
However, with the same, slightly older DBI version DBD-ODBC is working on our 
TEST environment, so:
4)  DBD-ODBC installed and responsive (executes "SELECT * FROM customer WHERE 
customer = ..."  ) on TEST environement same than PROD, same DBI 1.59..
 
Any clues appreciated. Thanks in advance..