Fixes to enable compilation on older systems

CMakeLists-implied-options.txt

@@ -352,6 +352,11 @@ if (LWS_IPV6)
 	set(LWS_WITH_IPV6 1)
 endif()
 
+if (LWS_HAVE_LINUX_IPV6_H AND NOT LWS_INCLUDE_LINUX_IPV6_H)
+	message(STATUS "Found linux/ipv6.h but not including it.")
+	set(LWS_HAVE_LINUX_IPV6_H 0)
+endif()
+
 if (LWS_UNIX_SOCK)
     set(LWS_WITH_UNIX_SOCK 1)
 endif()

CMakeLists.txt

@@ -153,6 +153,7 @@ option(LWS_WITH_HTTP2 "Compile with server support for HTTP/2" ON)
 option(LWS_WITH_LWSWS "Libwebsockets Webserver" OFF)
 option(LWS_WITH_CGI "Include CGI (spawn process with network-connected stdin/out/err) APIs" OFF)
 option(LWS_IPV6 "Compile with support for ipv6" OFF)
+option(LWS_INCLUDE_LINUX_IPV6_H "Include Linux ipv6.h header if found" ON)
 option(LWS_UNIX_SOCK "Compile with support for UNIX domain socket if OS supports it" ON)
 option(LWS_WITH_PLUGINS "Support plugins for protocols and extensions (implies LWS_WITH_PLUGINS_API)" OFF)
 option(LWS_WITH_PLUGINS_BUILTIN "Build the plugin protocols directly into lws library" OFF)

lib/roles/h1/ops-h1.c

@@ -974,8 +974,10 @@ static const char * const http_methods[] = {
 int
 _lws_is_http_method(const char *method)
 {
+	int n;
+
 	if (method)
-		for (int n = 0; n < (int)LWS_ARRAY_SIZE(http_methods); n++)
+		for (n = 0; n < (int)LWS_ARRAY_SIZE(http_methods); n++)
 			if (!strcmp(method, http_methods[n]))
 				return 1;
 

lib/roles/netlink/ops-netlink.c

@@ -35,6 +35,7 @@
 #include <sys/socket.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
+#include <linux/version.h>
 
 //#define lwsl_netlink lwsl_notice
 #define lwsl_cx_netlink		lwsl_cx_info
@@ -207,10 +208,12 @@ rops_handle_POLLIN_netlink(struct lws_context_per_thread *pt, struct lws *wsi,
 					lws_sa46_write_numeric_address(&robj.dest, buf, sizeof(buf));
 					lwsl_cx_netlink_debug(cx, "IFA_ADDRESS: %s/%d", buf, robj.dest_len);
 					break;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)
 				case IFA_FLAGS:
 					lwsl_cx_netlink_debug(cx, "IFA_FLAGS: 0x%x (not handled)",
 							*(unsigned int*)RTA_DATA(ra));
 					break;
+#endif
 				case IFA_BROADCAST:
 					lwsl_cx_netlink_debug(cx, "IFA_BROADCAST (not handled)");
 					break;

plugins/deaddrop/protocol_lws_deaddrop.c

@@ -419,8 +419,9 @@ handler_server_protocol_init(struct lws *wsi, void *in)
 	 * lws event loop on our vhost, so we can be told about
 	 * external changes to the dir contents
 	 */
-	vhd->inotify_fd = inotify_init1(IN_NONBLOCK);
+	vhd->inotify_fd = inotify_init();
 	if (vhd->inotify_fd >= 0) {
+		fcntl(vhd->inotify_fd, F_SETFL, O_NONBLOCK);
 		if (inotify_add_watch(vhd->inotify_fd, vhd->upload_dir,
 				      IN_CLOSE_WRITE | IN_DELETE |
 				      IN_MOVED_FROM | IN_MOVED_TO) >= 0)