+; Added at version 1.2.0:
+ png_permit_empty_plte
+ png_permit_mng_features
+
+; Added at version 1.2.2:
+ png_handle_as_unknown
+
+; Added at version 1.2.2 and deleted from 1.2.3:
+; png_zalloc
+; png_zfree
+
+; Added at version 1.2.4
+ png_malloc_warn
+
+; Added at version 1.2.6
+ png_set_user_limits
+ png_get_user_height_max
+ png_get_user_width_max
+; Added at version 1.2.7
+ png_set_add_alpha
+
+; Added at version 1.2.9
+ png_save_uint_32
+ png_save_uint_16
+ png_save_int_32
+ png_get_uint_31
+ png_set_expand_gray_1_2_4_to_8
+
+; Added at version 1.2.41
+ png_write_sig
+; png_benign_error
+; png_benign_chunk_error
+; png_set_benign_error
+ png_get_io_chunk_name
+ png_get_io_state
+ png_get_chunk_cache_max
+ png_set_chunk_cache_max
+ png_check_cHRM_fixed
+ png_calloc
+ png_set_longjmp_fn
+; Added at version 1.4.1
+ png_get_chunk_malloc_max
+ png_set_chunk_malloc_max
+; Added at version 1.4.2
+ png_set_quantize