sftp with chroot for Solaris 7

Hi,

        We have come across a problem in using sftp. We have configured the
sshd server to allow public key authentication only. Both ssh and sftp
connection from clients to the server are successful.
        But the user can roam over the file system. Some document suggests
to edit the openssh source code and re-compile the source. But it didn't
work. Do you know where can I get a compiled package for Solaris 7? The one
that we are using is from sunfreeware openssh-3.6.1p1-sol7-sparc-local.gz.
        Do you have any other suggestion?
        Thanks
Jone.