diff --git a/backends/networking/enet/source/unix.cpp b/backends/networking/enet/source/unix.cpp
index c0d74a2ddc2..bd5083fa817 100644
--- a/backends/networking/enet/source/unix.cpp
+++ b/backends/networking/enet/source/unix.cpp
@@ -53,6 +53,10 @@
 #include <poll.h>
 #endif
 
+#if !defined(HAS_SOCKLEN_T) && !defined(__socklen_t_defined)
+typedef int socklen_t;
+#endif
+
 #ifndef MSG_NOSIGNAL
 #define MSG_NOSIGNAL 0
 #endif
diff --git a/configure b/configure
index ad8c09dbe4f..728750341d2 100755
--- a/configure
+++ b/configure
@@ -4184,6 +4184,156 @@ fi
 #
 define_in_config_if_yes "$_enet" 'USE_ENET'
 
+
+#
+# Check and set additional defines needed for ENet.
+#
+if test "$_enet" = yes ; then
+	echo "Checks for ENet..."
+
+	echo_n "   "
+	echocheck "getaddrinfo"
+	cat > $TMPC << EOF
+#include <netdb.h>
+int main(void) { return getaddrinfo(0, 0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_GETADDRINFO"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "getnameinfo"
+	cat > $TMPC << EOF
+#include <netdb.h>
+int main(void) { return getnameinfo(0, 0, 0, 0, 0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_GETNAMEINFO"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "gethostbyaddr_r"
+	cat > $TMPC << EOF
+#include <netdb.h>
+int main(void) { return gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_GETHOSTBYADDR_R"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "gethostbyname_r"
+	cat > $TMPC << EOF
+#include <netdb.h>
+int main(void) { return gethostbyname_r(0, 0, 0, 0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_GETHOSTBYNAME_R"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "poll"
+	cat > $TMPC << EOF
+#include <poll.h>
+int main(void) { return poll(0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_POLL"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "fcntl"
+	cat > $TMPC << EOF
+#include <fcntl.h>
+int main(void) { return fcntl(0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_FCNTL"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "inet_pton"
+	cat > $TMPC << EOF
+#include <arpa/inet.h>
+int main(void) { return inet_pton(0, 0, 0); } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_INET_PTON"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "inet_ntop"
+	cat > $TMPC << EOF
+#include <arpa/inet.h>
+int main(void) { inet_ntop(0, 0, 0, 0); return 0; } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_INET_NTOP"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "msghdr.msg_flags"
+	cat > $TMPC << EOF
+#include <sys/socket.h>
+struct msghdr msg;
+int main(void) { return msg.msg_flags; } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_MSGHDR_FLAGS"
+		echo "yes"
+	else
+		echo "no"
+	fi
+
+	echo_n "   "
+	echocheck "socklen_t"
+	cat > $TMPC << EOF
+#include <sys/socket.h>
+int main(void) { socklen_t len = 0; return 0; } 
+EOF
+	cc_check
+	if test "$TMPR" -eq 0; then
+		append_var DEFINES "-DHAS_SOCKLEN_T"
+		echo "yes"
+	else
+		echo "no"
+	fi
+fi
+
+
 #
 # Enable 16bit support only for backends which support it
 #