The CS_LIBTCL_CFG property specifies the name and path to an alternate libtcl.cfg file. As in the CS_SYBASE_HOME property, CS_LIBTCL_CFG is set by cs_config() using a NULL context and must be set before a CS-Library context is allocated.
ret = cs_config(NULL, CS_SET, CS_LIBTCL_CFG, "/work/Sybase/OCS-15_0/config/libtcl.cfg", CS_NULLTERM, NULL);