CFLAGS="$CFLAGS -D_GNU_SOURCE"
# Checks for header files.
-AC_CHECK_HEADERS([arpa/inet.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h unistd.h windows.h winsock2.h pthread.h sys/epoll.h sys/kevent.h openssl/ssl.h openssl/err.h openssl/rand.h])
+AC_CHECK_HEADERS([stdio.h stdlib.h string.h ctype.h windows.h winsock2.h malloc.h features.h sys/types.h sys/socket.h netinet/in.h netinet/tcp.h arpa/inet.h netdb.h sys/wait.h errno.h unistd.h getopt.h stdarg.h sys/time.h time.h signal.h sys/epoll.h sys/event.h ws2tcpip.h mysql.h mysql/errmsg.h errmsg.h])
# Checks for typedefs, structures, and compiler characteristics.