--- a/rtengine/imageio.cc	Tue Sep 20 19:22:53 2011 +0200
+++ a/rtengine/imageio.cc	Fri Sep 23 18:12:48 2011 +0300
@@ -862,37 +862,37 @@ int ImageIO::saveTIFF (Glib::ustring fna
 // PNG read and write routines:
 
 void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) {
    png_size_t check;
 
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
-   check = (png_size_t)fread(data, (png_size_t)1, length, (FILE *)png_ptr->io_ptr);
+   check = (png_size_t)fread(data, (png_size_t)1, length, (FILE *)png_get_io_ptr(png_ptr));
 
    if (check != length)
    {
       png_error(png_ptr, "Read Error");
    }
 }
 
 void png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) {
    png_uint_32 check;
 
-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+   check = fwrite(data, 1, length, (FILE *)png_get_io_ptr(png_ptr));
    if (check != length)
    {
       png_error(png_ptr, "Write Error");
    }
 }
 
 void png_flush(png_structp png_ptr) {
    FILE *io_ptr;
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+   io_ptr = (FILE *)(png_get_io_ptr(png_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
 }
 
 int ImageIO::load (Glib::ustring fname) {
 
   int lastdot = fname.find_last_of ('.');
   if( Glib::ustring::npos == lastdot )