--- dip-3.3.7o/tty.c	Tue May 30 15:56:06 2000
+++ dip-3.3.7o/tty.c	Tue May 30 15:55:49 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