Hi Tobias,

On Sun, Jan 24, 2016 at 12:17 PM, Tobias Frost <[email protected]> wrote:
> (Resent -- buxtehude.d.o was down yesterday)
>
>> Gianfranco,
>> can you elaborate?
>> (Its not common that libpng16 patches breaks compatiblity with
>> libpng12)

It's just the way it's written. You can look here
http://sourceforge.net/p/tkimg/code/HEAD/tree/trunk/libpng/pngtclStubInit.c
and see that the tkimg library maintains a full internal table of
libpng interface functions (I guess it makes more sense for Windows
than for Linux but anyway), so if these function change then tkimg
loses its compatibility with the previous libpng version. There're no
changes from the user's point of view. All Tcl scripts that use tkimg
continue working as before.

Cheers!
-- 
Sergei Golovan

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