diff -ru SDL2_image-2.0.0.org/IMG_png.c sdl2_image-2.0.0/IMG_png.c
--- SDL2_image-2.0.0.org/IMG_png.c	2013-08-10 19:38:36.000000000 +0200
+++ sdl2_image-2.0.0/IMG_png.c	2014-07-03 19:57:14.773270137 +0200
@@ -76,6 +76,7 @@
 #if (PNG_LIBPNG_VER_MINOR < 6)
 typedef png_structp png_const_structrp;
 typedef png_infop png_const_inforp;
+typedef png_bytep png_const_bytep;
 #endif
 #endif