diff -Naru libpng-1.6.14.org/png.h libpng-1.6.14/png.h
--- libpng-1.6.14.org/png.h	2014-10-23 23:57:22.656674917 +0900
+++ libpng-1.6.14/png.h	2014-10-23 23:57:22.729677456 +0900
@@ -470,6 +470,10 @@
 #   include "pnglibconf.h"
 #endif
 
+#define PNG_APNG_SUPPORTED
+#define PNG_READ_APNG_SUPPORTED
+#define PNG_WRITE_APNG_SUPPORTED
+
 #ifndef PNG_VERSION_INFO_ONLY
    /* Machine specific configuration. */
 #  include "pngconf.h"
@@ -560,6 +564,17 @@
  * See pngconf.h for base types that vary by machine/system
  */
 
+#ifdef PNG_APNG_SUPPORTED
+/* dispose_op flags from inside fcTL */
+#define PNG_DISPOSE_OP_NONE        0x00
+#define PNG_DISPOSE_OP_BACKGROUND  0x01
+#define PNG_DISPOSE_OP_PREVIOUS    0x02
+
+/* blend_op flags from inside fcTL */
+#define PNG_BLEND_OP_SOURCE        0x00
+#define PNG_BLEND_OP_OVER          0x01
+#endif /* PNG_APNG_SUPPORTED */
+
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
@@ -880,6 +895,10 @@
 #define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
 #define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
 #define PNG_INFO_IDAT 0x8000   /* ESR, 1.0.6 */
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_INFO_acTL 0x10000
+#define PNG_INFO_fcTL 0x20000
+#endif
 
 /* This is used for the transformation routines, as some of them
  * change these values for the row.  It also should enable using
@@ -917,6 +936,10 @@
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
 typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
+#ifdef PNG_APNG_SUPPORTED
+typedef PNG_CALLBACK(void, *png_progressive_frame_ptr, (png_structp,
+    png_uint_32));
+#endif
 
 /* The following callback receives png_uint_32 row_number, int pass for the
  * png_bytep data of the row.  When transforming an interlaced image the
@@ -3255,6 +3278,74 @@
 /*******************************************************************************
  *  END OF HARDWARE AND SOFTWARE OPTIONS
  ******************************************************************************/
+#ifdef PNG_APNG_SUPPORTED
+PNG_EXPORT(245, png_uint_32, png_get_acTL, (png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 *num