pbulk: looks for pkg_admin under wrong prefix

[Mayuresh <mayuresh%acm.org@localhost>]

I have set pbulk by following /usr/pkgsrc/doc/HOWTO-pbulk

On running /usr/pbulk/bin/bulkbuild it says:

sh: /usr/pkg/sbin/pkg_admin: not found

In /usr/pbulk/etc/pbulk.conf these entries are present:

# The following programs must NOT be inside ${prefix}
pkg_add=/usr/pbulk/sbin/pkg_add
pkg_admin=/usr/pbulk/sbin/pkg_admin
pkg_delete=/usr/pbulk/sbin/pkg_delete
pkg_info=/usr/pbulk/sbin/pkg_info

Why are they not taking effect?

-- 
Mayuresh