3680415 - DB6: ABAP R3trans fails with unable to load DB2 library 'libdb2.so' -> Incorrect DB2DBDFT <SID> is used.

Testing the connection between SAP and Db2 LUW database.
R3trans -d fails with 

4 ETW000  [     dev trc,00000]  Supported features:
4 ETW000  [     dev trc,00000]  ..retrieving configuration parameters
4 ETW000  [     dev trc,00000]  ..done
4 ETW000  [dbdb6.c     ,00000]  
*** ERROR => unable to load DB2 library 'libdb2.so'. Reason: libdb2.so: cannot open shared object file: No such file or directory
4 ETW000  [     dev trc,00000]  
*** ERROR in getConfigurationAndEnvironmentHandle[/bas/753_REL/src/dbs/db6/dbdb6.c, 13741] CON = -1 CACHEID = -1 (BEGIN)
4 ETW000  [     dev trc,00000]  &+    
DbSlConnectDB6: Unable to load DB2 libraries. Connect failed.
no connect possible: "DBMS = DB6  --- DB2DBDFT = '<SID>' 

DB2 LUW IBM

ETW000, EETW169, dev trc, dbdb6.c, ERROR, unable to load DB2 library, libdb2.so, cannot open shared object file, CON = -1, CACHEID = -1, DbSlConnectDB6, Connect failed, no connect possible, DBMS = DB6, DB2DBDFT = '<SID>', retrieving configuration parameters, environment setup, library path, shared object linking, DB2 connectivity, runtime initialization  , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem