3680366 - DB6: R3trans fails with DbSlConnectDB6: Unable to load DB2 libraries. Connect failed.-> 'libdb2.so'

Testing connection to the database via R3trans -d fails with errors like. 

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.
2EETW169 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,  DB2 connectivity, runtime initialisation, initialization. ABAP, , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem