+o Upgrading from a version prior to 1.7.4:
+
+ Starting with sudo 1.7.4, the time stamp files have moved from
+ /var/run/sudo to either /var/db/sudo, /var/lib/sudo or /var/adm/sudo.
+ The directories are checked for existence in that order. This
+ prevents users from receiving the sudo lecture every time the
+ system reboots. Time stamp files older than the boot time are
+ ignored on systems where it is possible to determine this.
+
+ Additionally, the tty_tickets sudoers option is now enabled by
+ default. To restore the old behavior (single time stamp per user),
+ add a line like:
+ Defaults !tty_tickets
+ to sudoers or use the --without-tty-tickets configure option.
+
+ The HOME and MAIL environment variables are now reset based on the
+ target user's password database entry when the env_reset sudoers option
+ is enabled (which is the case in the default configuration). Users
+ wishing to preserve the original values should use a sudoers entry like:
+ Defaults env_keep += HOME
+ to preserve the old value of HOME and
+ Defaults env_keep += MAIL
+ to preserve the old value of MAIL.
+
+ NOTE: preserving HOME has security implications since many programs
+ use when searching for configuration files. Adding HOME to env_keep
+ may enable a user to run unrestricted commands via sudo.
+
+ The default syslog facility has changed from "local2" to "authpriv"
+ (or "auth" if the operating system doesn't have "authpriv").
+ The --with-logfac configure option can be used to change this
+ or it can be changed in the sudoers file.
+
+o Upgrading from a version prior to 1.7.0:
+
+ Starting with sudo 1.7.0, comments in the sudoers file must not
+ have a digit or minus sign immediately after the comment character
+ ('#'). Otherwise, the comment may be interpreted as a user or
+ group ID.
+
+ When sudo is build with LDAP support the /etc/nsswitch.conf file is
+ now used to determine the sudoers seach order. sudo will default to
+ only using /etc/sudoers unless /etc/nsswitch.conf says otherwise.
+ This can be changed with an nsswitch.conf line, e.g.:
+ sudoers: ldap files
+ Would case LDAP to be searched first, then the sudoers file.
+ To restore the pre-1.7.0 behavior, run configure with the
+ --with-nsswitch=no flag.
+
+ Sudo now ignores user .ldaprc files as well as system LDAP defaults.
+ All LDAP configuration is now in /etc/ldap.conf (or whichever file
+ was specified by configure's --with-ldap-conf-file option).
+ If you are using TLS, you may now need to specify:
+ tls_checkpeer no
+ in sudo's ldap.conf unless ldap.conf references a valid certificate
+ authority file(s).
+
+ Please also see the NEWS file for a list of new features in
+ sudo 1.7.0.
+