--- apngdis-2.6-src/apngdis.cpp
+++ apngdis-2.6-src/apngdis.cpp
@@ -29,6 +29,7 @@
  */
 #include <stdio.h>
 #include <stdlib.h>
+#include <cstring>
 #include <vector>
 #include "png.h"     /* original (unpatched) libpng is ok */
 #include "zlib.h"