Hello: The config header checks for windows' ws2tcpip.h have a little bug where they do not include winsock2.h before ws2tcpip.h: ws2tcpip.h requires winsock2.h to be included before, a plain AC_CHECK_HEADERS([ws2tcpip.h]) like in current m4/sys_socket_h.m4 may fail to detect the header's presence. A solution may be changing the CFLAGS temporarily by adding "-include winsock2.h" to it.
Regards. -- Ozkan
