First stab

src/net.h

@@ -24,7 +24,7 @@ struct mg_mgr {
   int dnstimeout;               // DNS resolve timeout in milliseconds
   unsigned long nextid;         // Next connection ID
   void *userdata;               // Arbitrary user data pointer
-#if MG_ARCH == MG_ARCH_FREERTOS
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
   SocketSet_t ss;  // NOTE(lsm): referenced from socket struct
 #endif
 };