diff --git a/bin/makefile-tail b/bin/makefile-tail
index cce0bca..ad64c19 100644
--- a/bin/makefile-tail
+++ b/bin/makefile-tail
@@ -842,8 +842,8 @@ $(OBJECTDIR)timer.o: $(SRCDIR)timer.c $(REQUIRED-INCS) \
 
 $(OBJECTDIR)tty.o: $(SRCDIR)tty.c $(REQUIRED-INCS) \
 	$(INCDIR)lispemul.h $(INCDIR)lispmap.h \
-	$(INCDIR)adr68k.h $(INCDIR)lsptypes.h $(INCDIR)lspglob.h $(INCDIR)ifpage.h \
-	$(INCDIR)iopage.h $(INCDIR)miscstat.h $(INCDIR)commondefs.h $(INCDIR)tty.h
+	$(INCDIR)adr68k.h $(INCDIR)lsptypes.h $(INCDIR)lspglob.h \
+	$(INCDIR)commondefs.h $(INCDIR)tty.h $(INCDIR)ttydefs.h
 	$(CC) $(RFLAGS) $(SRCDIR)tty.c -o $(OBJECTDIR)tty.o
 
 $(OBJECTDIR)typeof.o: $(SRCDIR)typeof.c $(REQUIRED-INCS) \
diff --git a/inc/ttydefs.h b/inc/ttydefs.h
new file mode 100644
index 0000000..ecb4d3e
--- /dev/null
+++ b/inc/ttydefs.h
@@ -0,0 +1,14 @@
+#ifndef TTYDEFS_H
+#define TTYDEFS_H 1
+void tty_init(void);
+void tty_open(void);
+void tty_close(void);
+void tty_get(void);
+void tty_put(void);
+void tty_setbaudrate(void);
+void tty_setparam(void);
+void tty_breakon(void);
+void tty_breakoff(void);
+void tty_cmd(void);
+void tty_debug(const char *name);
+#endif
diff --git a/src/tty.c b/src/tty.c
index 86447cd..d8b456b 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -23,6 +23,7 @@
 #include "lspglob.h"
 #include "commondefs.h"
 #include "tty.h"
+#include "ttydefs.h"
 
 DLTTY_OUT_COMMAND *DLTTYPortCmd;
 DLTTY_IN_CSB *DLTTYIn;
@@ -108,7 +109,7 @@ void tty_put(void)
   }
 }
 
-speed_t tty_baudtosymbol(short aBaud)
+static speed_t tty_baudtosymbol(short aBaud)
 {
   /* This matches the constants in DLTTY where possible. */
   if (aBaud == 0) return (B50);