The PNG patch was taken from the pkgsrc patch for povray 3.6.1, and adapted to MegaPOV. Note that POV-Ray 3.7 has not problem compiling against PNG 1.5
To apply it:
povray-3.6.1-png15.patch/code>
(for POV-Ray 3.6) or megapov-png15.patch
(for MegaPOV 1.2.1).tar zxvf megapov-1.2.1.tgz
cd megapov-1.2.1; patch -p1 -d. < ../megapov-1.2.1-png15.patch
- Frédéric Devernay, Nov. 2012