65                png_warning(png_ptr, "Writing zero-length unknown chunk");  in write_unknown_chunks()
100       png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");  in png_write_info_before_PLTE()
296           png_warning(png_ptr, "Unable to write international text");  in png_write_info()
311          png_warning(png_ptr, "Unable to write compressed text");  in png_write_info()
328          png_warning(png_ptr, "Unable to write uncompressed text");  in png_write_info()
391             png_warning(png_ptr, "Unable to write international text");  in png_write_end()
405             png_warning(png_ptr, "Unable to write compressed text");  in png_write_end()
418             png_warning(png_ptr, "Unable to write uncompressed text");  in png_write_end()
699          png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined");  in png_write_row()
704          png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined");  in png_write_row()
709          png_warning(png_ptr,  in png_write_row()
715          png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined");  in png_write_row()
720          png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined");  in png_write_row()
725          png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined");  in png_write_row()
730          png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined");  in png_write_row()
1056                png_warning(png_ptr, "Can't add Up filter after starting");  in png_set_filter()
1073                png_warning(png_ptr, "Can't add Average filter after starting");  in png_set_filter()
1091                png_warning(png_ptr, "Can't add Paeth filter after starting");  in png_set_filter()
1230       png_warning(png_ptr, "Unknown filter heuristic method");  in png_init_filter_heuristics()
1411       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");  in png_set_compression_window_bits()
1417       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");  in png_set_compression_window_bits()
1436       png_warning(png_ptr, "Only compression method 8 is supported by PNG");  in png_set_compression_method()
1487       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");  in png_set_text_compression_window_bits()
1493       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");  in png_set_text_compression_window_bits()
1509       png_warning(png_ptr, "Only compression method 8 is supported by PNG");  in png_set_text_compression_method()