Imported from gentoo
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/x11-libs/fltk/files/fltk-1.1.10-libpng15.patch

--- a/src/Fl_PNG_Image.cxx
+++ b/src/Fl_PNG_Image.cxx
@@ -66,7 +66,8 @@ Fl_PNG_Image::Fl_PNG_Image(const char *png) // I - File to read
   png_structp	pp;			// PNG read pointer
   png_infop	info;			// PNG info pointers
   png_bytep	*rows;			// PNG row pointers
-
+  png_byte     color_type;             // PNG color type
+  png_byte     bit_depth;              // PNG bit depth
 
   // Open the PNG file...
   if ((fp = fopen(png, "rb")) == NULL) return;
@@ -75,7 +76,7 @@ Fl_PNG_Image::Fl_PNG_Image(const char *png) // I - File to read
   pp   = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
   info = png_create_info_struct(pp);
 
-  if (setjmp(pp->jmpbuf))
+  if (setjmp(png_jmpbuf(pp)))
   {
     Fl::warning("PNG file \"%s\" contains errors!\n", png);
     return;
@@ -86,28 +87,24 @@ Fl_PNG_Image::Fl_PNG_Image(const char *png) // I - File to read
 
   // Get the image dimensions and convert to grayscale or RGB...
   png_read_info(pp, info);
+  color_type = png_get_color_type(pp, info);
 
-  if (info->color_type == PNG_COLOR_TYPE_PALETTE)
+  if (color_type == PNG_COLOR_TYPE_PALETTE)
     png_set_expand(pp);
 
-  if (info->color_type & PNG_COLOR_MASK_COLOR)
-    channels = 3;
-  else
-    channels = 1;
-
-  if ((info->color_type & PNG_COLOR_MASK_ALPHA) || info->num_trans)
-    channels ++;
+  channels = png_get_channels(pp, info);
 
-  w((int)(info->width));
-  h((int)(info->height));
+  w((int)(png_get_image_width(pp, info)));
+  h((int)(png_get_image_height(pp, info)));
   d(channels);
 
-  if (info->bit_depth < 8)
+  bit_depth = png_get_bit_depth(pp, info);
+  if (bit_depth < 8)
   {
     png_set_packing(pp);
     png_set_expand(pp);
   }
-  else if (info->bit_depth == 16)
+  else if (bit_depth == 16)
     png_set_strip_16(pp);
 
 #  if defined(HAVE_PNG_GET_VALID) && defined(HAVE_PNG_SET_TRNS_TO_ALPHA)
