NO TALKING HERE. If you have a package failing, you should open a new bug and make it block this one.
You can use libpng-1.4.x to report bugs for this tracker by using following
egrep 'warning.*is deprecated.*/png\.h' <name of a build.log>
Because those will be fatal errors in libpng 1.5.x now.
Minor note - matplotlib checks for libpng via 'pkg-config libpng'.
(In reply to comment #2)
> Minor note - matplotlib checks for libpng via 'pkg-config libpng'.
Sorry, wrong bug.
Notes: the following packages use libpng but don't list it in their dependencies (might rely on transitive dependencies):
Time to close this. Porting is over and remaining cruft will be handled as needed.
 pngcrush, optipng and tkimg