--- /dev/null
+dns320l-mcu: Fix compilation with GCC 14
+
+This fixes the following compile problem:
+```
+dns320l-daemon.c: In function 'main':
+dns320l-daemon.c:740:18: error: implicit declaration of function 'isprint' [-Wimplicit-function-declaration]
+ 740 | else if (isprint (optopt))
+ | ^~~~~~~
+dns320l-daemon.c:50:1: note: include '<ctype.h>' or provide a declaration of 'isprint'
+ 49 | #include "dns320l-daemon.h"
+ +++ |+#include <ctype.h>
+ 50 |
+dns320l-daemon.c:799:5: error: implicit declaration of function 'umask' [-Wimplicit-function-declaration]
+ 799 | umask(0);
+ | ^~~~~
+dns320l-daemon.c:864:5: error: 'return' with no value, in function returning non-void [-Wreturn-mismatch]
+ 864 | return;
+ | ^~~~~~
+dns320l-daemon.c:691:5: note: declared here
+ 691 | int main(int argc, char *argv[])
+ | ^~~~
+```
+
+--- a/dns320l-daemon.c
++++ b/dns320l-daemon.c
+@@ -26,6 +26,7 @@
+
+ */
+
++#include <ctype.h>
+ #include <errno.h>
+ #include <termios.h>
+ #include <unistd.h>
+@@ -39,6 +40,7 @@
+ #include <sys/ioctl.h>
+ #include <sys/types.h>
+ #include <sys/time.h>
++#include <sys/stat.h>
+ #include <time.h>
+ #include <arpa/inet.h>
+ #include <netinet/in.h>
+@@ -861,7 +863,7 @@ int main(int argc, char *argv[])
+ if (fd < 0)
+ {
+ syslog(LOG_ERR, "error %d opening %s: %s", errno, stDaemonConfig.portName, strerror (errno));
+- return;
++ return EXIT_FAILURE;
+ }
+
+ set_interface_attribs (fd, B115200, 0); // set speed to 115,200 bps, 8n1 (no parity)