--- openjpeg-2.3.1/src/lib/openjpip/sock_manager.c.orig	2019-04-04 03:29:40.223754700 -0400
+++ openjpeg-2.3.1/src/lib/openjpip/sock_manager.c	2019-04-04 03:35:01.793021400 -0400
@@ -29,6 +29,8 @@
  */
 
 #ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
 #include <windows.h>
 #ifdef _MSC_VER
 typedef SSIZE_T ssize_t;