--- tty.c.orig  Tue Mar 21 18:40:25 2000
+++ tty.c       Tue Mar 21 18:41:06 2000
@@ -30,6 +30,7 @@
 #include <sys/stat.h>
 #ifdef LINUX
 #ifndef NO_SERIAL
+#include <linux/types.h>
 #   include <linux/serial.h> /* for Linux-1.1.13 */
 #endif /* ~NO_SERIAL */
 #endif