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22.20 Version 3.9.1
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Released July, 2010.

3.2.1

     Date-based version components should be given as the four-digit
     year, two-digit month, and then two-digit day, but may have
     embedded punctuation.

3.9

     Maintainer scripts must pass ‘--package’ to ‘dpkg-divert’ when
     creating or removing diversions and must not use ‘--local’.

4.10

     Only ‘dpkg-gencontrol’ supports variable substitution.
     ‘dpkg-genchanges’ (for ‘*.changes’) and ‘dpkg-source’ (for ‘*.dsc’)
     do not.

7.1

     Architecture restrictions and wildcards are also allowed in binary
     package relationships provided that the binary package is not
     architecture-independent.

7.4

     ‘Conflicts’ and ‘Breaks’ should only be used when there are file
     conflicts or one package breaks the other, not just because two
     packages provide similar functionality but don’t interfere.

8.1

     The SONAME of a library should change whenever the ABI of the
     library changes in a way that isn’t backward-compatible.  It should
     not change if the library ABI changes are backward-compatible.
     Discourage bundling shared libraries together in one package.

8.4

     Ada Library Information (‘*.ali’) files must be installed
     read-only.

8.6.1, 8.6.2, 8.6.5

     Packages should normally not include a ‘shlibs.local’ file since we
     now have complete ‘shlibs’ coverage.

8.6.3

     The SONAME of a library may instead be of the form
     ‘name-major-version.so’.

10.2

     Libtool ‘.la’ files should not be installed for public libraries.
     If they’re required (for ‘libltdl’, for instance), the
     ‘dependency_libs’ setting should be emptied.  Library packages
     historically including ‘.la’ files must continue to include them
     (with ‘dependency_libs’ emptied) until all libraries that depend on
     that library have removed or emptied their ‘.la’ files.

10.2

     Libraries no longer need to be built with ‘-D_REENTRANT’, which was
     an obsolete LinuxThreads requirement.  Instead, say explicitly that
     libraries should be built with threading support and to be
     thread-safe if the library supports this.

10.4

     ‘/bin/sh’ scripts may assume that ‘kill’ supports an argument of
     ‘-signal’, that ‘kill’ and ‘trap’ support the numeric signals
     listed in the XSI extension, and that signal 13 (SIGPIPE) can be
     trapped with ‘trap’.

10.8

     Use of ‘/etc/logrotate.d/package’ for logrotate rules is now
     recommended.

10.9

     Control information files should be owned by ‘root:root’ and either
     mode 644 or mode 755.

11.4, 11.8.3, 11.8.4

     Packages providing alternatives for ‘editor’, ‘pager’,
     ‘x-terminal-emulator’, or ‘x-window-manager’ should also provide a
     slave alternative for the corresponding manual page.

11.5

     Cgi-bin executable files may be installed in subdirectories of
     ‘/usr/lib/cgi-bin’ and web servers should serve out executables in
     those subdirectories.

12.5

     The GPL version 1 is now included in common-licenses and should be
     referenced from there instead of included in the ‘copyright’ file.