diff --git a/include/libwebsockets.h b/include/libwebsockets.h
index 87ff280885..05ede8de98 100644
--- a/include/libwebsockets.h
+++ b/include/libwebsockets.h
@@ -146,7 +146,7 @@ typedef int suseconds_t;
 #include <sys/capability.h>
 #endif
 
-#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__QNX__) || defined(__OpenBSD__)
+#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__QNX__) || defined(__OpenBSD__) || defined(__NuttX__)
 #include <sys/socket.h>
 #include <netinet/in.h>
 #endif
diff --git a/lib/plat/unix/private-lib-plat-unix.h b/lib/plat/unix/private-lib-plat-unix.h
index 1aa9e80798..7f84e6cb14 100644
--- a/lib/plat/unix/private-lib-plat-unix.h
+++ b/lib/plat/unix/private-lib-plat-unix.h
@@ -123,7 +123,7 @@ typedef pthread_mutex_t lws_mutex_t;
 
 #endif
 
-#if defined (__sun) || defined(__HAIKU__) || defined(__QNX__) || defined(__ANDROID__)
+#if defined (__sun) || defined(__HAIKU__) || defined(__QNX__) || defined(__ANDROID__) || defined(__NuttX__)
 #include <syslog.h>
 
 #if defined(__ANDROID__)
diff --git a/lib/plat/unix/unix-sockets.c b/lib/plat/unix/unix-sockets.c
index 47ad6a85e5..2a3069b544 100644
--- a/lib/plat/unix/unix-sockets.c
+++ b/lib/plat/unix/unix-sockets.c
@@ -171,7 +171,7 @@ lws_plat_set_socket_options(struct lws_vhost *vhost, int fd, int unix_skt)
 
 	/* Disable Nagle */
 	optval = 1;
-#if defined (__sun) || defined(__QNX__)
+#if defined (__sun) || defined(__QNX__) || defined(__NuttX__)
 	if (!unix_skt && setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 		return 1;
 #elif !defined(__APPLE__) && \
@@ -190,6 +190,7 @@ lws_plat_set_socket_options(struct lws_vhost *vhost, int fd, int unix_skt)
 	return lws_plat_set_nonblocking(fd);
 }
 
+#if !defined(__NuttX__)
 static const int ip_opt_lws_flags[] = {
 	LCCSCF_IP_LOW_LATENCY, LCCSCF_IP_HIGH_THROUGHPUT,
 	LCCSCF_IP_HIGH_RELIABILITY
@@ -210,6 +211,7 @@ static const char *ip_opt_names[] = {
 #endif
 };
 #endif
+#endif
 
 int
 lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
@@ -237,7 +239,8 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
       !defined(__sun) && \
       !defined(__HAIKU__) && \
       !defined(__CYGWIN__) && \
-      !defined(__QNX__)
+      !defined(__QNX__) && \
+      !defined(__NuttX__)
 
 	/* the BSDs don't have SO_PRIORITY */
 
@@ -270,6 +273,7 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
 	}
 
 
+#if !defined(__NuttX__)
 	for (n = 0; n < 4; n++) {
 		if (!(lws_flags & ip_opt_lws_flags[n]))
 			continue;
@@ -287,6 +291,7 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
 			lwsl_notice("%s: set ip flag %s\n", __func__,
 				    ip_opt_names[n]);
 	}
+#endif
 
 	return ret;
 }
diff --git a/lib/roles/ws/client-ws.c b/lib/roles/ws/client-ws.c
index bc2a84682a..750aea96f0 100644
--- a/lib/roles/ws/client-ws.c
+++ b/lib/roles/ws/client-ws.c
@@ -257,15 +257,15 @@ lws_client_ws_upgrade(struct lws *wsi, const char **cce)
 	}
 
 	if (wsi->http.ah->http_response == 401) {
-		lwsl_wsi_warn(wsi, "got bad HTTP response '%d'",
-			      wsi->http.ah->http_response);
+		lwsl_wsi_warn(wsi, "got bad HTTP response '%ld'",
+			      (long)wsi->http.ah->http_response);
 		*cce = "HS: ws upgrade unauthorized";
 		goto bail3;
 	}
 
 	if (wsi->http.ah->http_response != 101) {
-		lwsl_wsi_warn(wsi, "got bad HTTP response '%d'",
-			      wsi->http.ah->http_response);
+		lwsl_wsi_warn(wsi, "got bad HTTP response '%ld'",
+			      (long)wsi->http.ah->http_response);
 		*cce = "HS: ws upgrade response not 101";
 		goto bail3;
 	}
diff --git a/lib/secure-streams/system/auth-sigv4/sign.c b/lib/secure-streams/system/auth-sigv4/sign.c
index 93f96db551..b797e157bb 100644
--- a/lib/secure-streams/system/auth-sigv4/sign.c
+++ b/lib/secure-streams/system/auth-sigv4/sign.c
@@ -464,7 +464,7 @@ lws_ss_sigv4_set_aws_key(struct lws_context* context, uint8_t idx,
 
 #if defined(__linux__) || defined(__APPLE__) || defined(WIN32) || \
 	defined(__FreeBSD__) || defined(__NetBSD__) || defined(__ANDROID__) || \
-	defined(__sun) || defined(__OpenBSD__)
+	defined(__sun) || defined(__OpenBSD__) || defined(__NuttX__)
 
 /* ie, if we have filesystem ops */