http://www.courtesan.com/sudo/

$ tar zxf sudo-1.6.3p7.tar.gz
$ cd sudo-1.6.3p7
$ ./configure
$ make
$ su
# make install

/usr/local/bin/sudo
/usr/local/sbin/visudo

visudo のサンプル
# sudoers file.
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the sudoers man page for the details on how to write a sudoers file.
#

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL) ALL

who  ALL=/usr/sbin/useradd,/usr/local/bin/vi /etc/group,/bin/chgrp,/usr/bin/passwd


sudo の使い方
$ sudo useradd user2

一度パスワードを入力すると 5 分間有効。