On AIX 5.3 with cvs head when trying to connect to the backend with createuser or psql i get
psql: FATAL: unsupported frontend protocol 0.0: server supports 1.0 to 3.0 Help ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match