--- a/lib/pngstream.cc

+++ b/lib/pngstream.cc

@@ -83,7 +83,12 @@ namespace iscan

 #if HAVE_PNG_H

     set_error_handler (_png, _info);

+/* when not interlacing (ie, only one pass), number of rows is image height:  _v_sz */

+#if PNG_LIBPNG_VER > 10499

+        if (!_footer && _v_sz == lib->get_current_row_number(_png))

+#else

     if (_header && !_footer && _png->num_rows == _png->flush_rows)

+#endif

       {

         lib->write_end (_png, _info);

         _footer = true;

@@ -157,6 +162,9 @@ namespace iscan

     funcsym (write_row);

     funcsym (write_flush);

     funcsym (write_end);

+#if PNG_LIBPNG_VER > 10499

+    funcsym (get_current_row_number);

+#endif

     if (lib->access_version_number

         && lib->create_write_struct

@@ -166,6 +174,9 @@ namespace iscan

         && lib->set_IHDR

         && lib->set_pHYs

         && lib->set_invert_mono

+#if PNG_LIBPNG_VER > 10499

+   && lib->get_current_row_number

+#endif

         && lib->write_info

         && lib->write_row

         && lib->write_flush

--- a/lib/pngstream.hh

+++ b/lib/pngstream.hh

@@ -108,6 +108,10 @@ namespace iscan

                png_structp);

       fundecl (void, write_end,

                png_structp, png_infop);

+#if PNG_LIBPNG_VER > 10499

+      fundecl (png_uint_32, get_current_row_number,

+               png_structp);

+#endif

 #endif /* HAVE_PNG_H */

     };

     static png_lib_handle *lib;

​