In RH 6.0 with postgresql-clients 6.4.2 the "pgaccess"
tcl/tk program does not work. The cause seems to be a
problem with the libpgtcl.so library.
The output of an attempt to run pgaccess is as follows:

Error in startup script: couldn't load file "libpgtcl.so":
/usr/lib/libpgtcl.so: undefined symbol: crypt
    while executing
"load libpgtcl.so"
    (procedure "main" line 6)
    invoked from within
"main $argc $argv"
    (file "/usr/bin/pgaccess" line 4954)