On 02/11/2014 02:03 PM, David C. Rankin wrote: > experimentation. It builds well on all of the boxes I have, but I suspect you > have to force it to build against libpng 1.2 in order for it to do what it is > supposed to. I'll continue to experiment. If you have few spare minutes give it > a try and let me know if you can see any discernible difference in the new/old > png files. I haven't yet. libpng14 is the minimum it will build against. If you attempt to build against libpng12, you will get: brokenpng.c:(.text+0x128): undefined reference to `png_set_longjmp_fn' -- David C. Rankin, J.D.,P.E.