This implies that all environment variables are removed, except for
HOME, LOGNAME, PATH, SHELL, TERM, DISPLAY, XAUTHORITY, XAUTHORIZATION,
-LANG, LANGUAGE, LC_*, and USER.
+XAPPLRESDIR, XFILESEARCHPATH, XUSERFILESEARCHPATH, LANG, LANGUAGE, LC_*,
+and USER.
In case you want sudo to preserve more environment variables, you must
specify the env_keep variable in the sudoers file. You should edit the
Preserve the default variables plus all variables starting with LC_:
Defaults env_keep+="LC_*"
+
+ - - - - -
+
+If you're using the sudo-ldap package, note that it is now configured to
+look for /etc/sudo-ldap.conf. Depending on your system configuration, it
+probably makes sense for this to be a symlink to /etc/ldap.conf, or perhaps
+to /etc/libnss-ldap.conf or /etc/pam_ldap.conf. By default, no symlink or
+file is provided, you'll need to decide what to do and create a suitable
+file before sudo-ldap will work.
+
+ - - - - -
+
+See the file OPTIONS in this directory for more information on the sudo
+build options used in building the Debian package.
+
+ - - - - -
+
+If you're having trouble grasping the fundamental idea of what sudo is all
+about, here's a succinct and humorous take on it...
+
+ http://www.xkcd.com/c149.html
+