+ Remove $existing_command from the list of commands to run
+ in all sequences.
+
+add_command($new_command, $sequence)
+ Add $new_command to the beginning of the specified sequence.
+ If the sequence does not exist, it will be created.
+
+add_command_options($command, $opt1, $opt2, ...)
+ Append $opt1, $opt2 etc. to the list of additional options which
+ dh passes when running the specified $command. These options are
+ not relayed to debhelper commands called via $command override.
+
+remove_command_options($command)
+ Clear all additional $command options previously added with
+ add_command_options().
+
+remove_command_options($command, $opt1, $opt2, ...)
+ Remove $opt1, $opt2 etc. from the list of additional options which
+ dh passes when running the specified $command.
+
+Buildsystem Classes:
+-------------------
+
+The dh_auto_* commands are frontends that use debhelper buildsystem
+classes. These classes have names like Debian::Debhelper::Buildsystem::foo,
+and are derived from Debian::Debhelper::Buildsystem, or other, related
+classes.
+
+A buildsystem class needs to inherit or define these methods: DESCRIPTION,
+check_auto_buildable, configure, build, test, install, clean. See the comments
+inside Debian::Debhelper::Buildsystem for details. Note that this interface
+is still subject to change.
+
+Note that third-party buildsystems will not automatically be used by default,
+but can be forced to be used via the --buildsystem parameter.