/usr/share/doc/libpng12-0/README.Debian is in libpng12-0 1.2.49-1+deb7u2.
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There have been changes in the way libpng is handled. Currently, there
are 2 versions of libpng in Debian at a time : libpng10 and libpng12,
formerly known as libpng2 and libpng3.
* The libpng10-0 and libpng12-0 packages contain the runtime for apps
built with these new libraries.
* libpng2 and libpng3 contain compatibility symlinks to let apps built
with older versions work correctly.
* libpng10-dev and libpng12-dev are the corresponding development
packages. You should only use libpng10-dev to build packages using
gdk-imlib1.
* libpng2-dev and libpng3-dev provide compatibility symlinks to build
applications still build-depending on those.
A package linking with libpng should use as build-depends :
* libpng-dev for small packages not depending on other libraries which
use or may use libpng.
* libpng10-dev for packages also linking with gdk-imlib1 or gnome 1.
* libpng12-dev for packages also linking with SDL, Gnome 2, Qt, or any
other library using libpng12.
This version diverges from upstream in 3 ways :
1) the library is explicitly linked with -lm -lz
2) libpng.so.3 is just a compatibility symlink
3) symbols are versioned
-- Junichi Uekawa <dancer@debian.org>, Mon Oct 28 2002 12:27:54
-- Josselin Mouette <joss@debian.org>, Tue Jun 10 2003 18:16:17 +0200
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