initdb problem - ld.so.1

Hi,

I am using Solaris 10 5/08 x86.  I have downloaded the 8.3 binary and install in under /usr.

When I initdb by su postgres:
$ /usr/postgres/8.3-community/bin/64/initdb -D /var/lib/pgsql/data

output:
ld.so.1: initdb: fatal: libxslt.so.1: open failed: No such file or directory
Killed

What's going on?  How can I solve it?

Regards,
Terence