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22.11 Version 4.0.1
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Released August, 2017.

2.5

     Priorities are now used only for controlling which packages are
     part of a minimal or standard Debian installation and should be
     selected based on functionality provided directly to users (so
     nearly all shared libraries should have a priority of ‘optional’).
     Packages may now depend on packages with a lower priority.

     The ‘extra’ priority has been deprecated and should be treated as
     equivalent to ‘optional’.  All ‘extra’ priorities should be changed
     to ‘optional’.  Packages with a priority of ‘optional’ may conflict
     with each other (but packages that both have a priority of
     ‘standard’ or higher still may not conflict).

5.6.30

     New section documenting the ‘Testsuite’ field in Debian source
     control files.

8.1.1

     Shared libraries must now invoke ‘ldconfig’ by means of triggers,
     instead of maintscripts.

9.3.3

     Packages are recommended to use debhelper tools instead of invoking
     ‘update-rc.d’ and ‘invoke-rc.d’ directly.

9.3.3

     Policy’s description of how the local system administrator may
     modify the runlevels at which a daemon is started and stopped, and
     how init scripts may depend on other init scripts, have been
     removed.  These are now handled by LSB headers.

9.4

     Policy’s specification of the console messages that should be
     emitted by ‘init.d’ scripts has been removed.  This is now defined
     by LSB, for sysvinit, and is not expected to be followed by other
     init systems.

9.6

     Packages installing a Free Desktop entry must not also install a
     Debian menu system entry.

9.9

     The prohibition against depending on environment variables for
     reasonable defaults is only for programs on the system PATH and
     only for custom environment variable settings (not, say, a sane
     PATH).