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/usr/share/doc/libtiff5/README.Debian is in libtiff5 4.0.3-7.

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The actual contents of the file can be viewed below.

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Note that tiff 4.x packages libtiff5, while tiff 3.x packaged
libtiff4.  During the libtiff4 -> libtiff5 transition, the tiff source
package is providing transitional packages for libtiff4-dev and
libtiff5-alt-dev.  If you have a package with a build dependency on
libtiff-dev, you don't have to care about any of this.  Otherwise, the
notes below describe what you should do to make sure your package is
ready for the transition.

 * If your package build-depends on libtiff-dev already, no action
   required; the release team will automatically schedule a rebuild of
   your package at the appropriate time.

 * If your package depends on libtiff4-dev but can work fine with tiff
   4.x (most packages), replace your dependency on libtiff4-dev with a
   new dependency on libtiff-dev.

 * If your package build-depends on libtiff5-dev or libtiff5-alt-dev and
   is known to work with both tiff 3.x and tiff 4.x (i.e., it does not
   use the BIGTIFF extensions in tiff 4.x), you can just change the
   build dependency to an unversioned libtiff-dev.  You can also remove
   any special code that you may have added to your package to get it to
   find tiff in the non-standard location.  If you were finding tiff
   with pkg-config, you shouldn't have to make any changes to your
   package other than the build dependency.

 * If your package build-depends on libtiff5-dev, you don't HAVE to do
   anything, but you may be helping yourself in the future if you change
   the build dependency to libtiff-dev (>> 4.0.3-6~).

 -- Jay Berkenbilt <qjb@debian.org>, Thu,  5 Dec 2013 12:55:17 -0500