diff --git a/scsh/tty.c b/scsh/tty.c
index 698457a..ad2fced 100644
--- a/scsh/tty.c
+++ b/scsh/tty.c
@@ -6,6 +6,8 @@
 #include <stdlib.h> /* For malloc. */
 #include "libcig.h"
 
+#include <sys/types.h>
+
 #include <unistd.h>
 #include <termios.h>
 
@@ -73,7 +75,7 @@ scheme_value df_tcsendbreak(long nargs, scheme_value *args)
 
 scheme_value df_tcdrain(long nargs, scheme_value *args)
 {
-    extern int tcdrain(int );
+    
     scheme_value ret1;
     int r1;
 
@@ -85,7 +87,7 @@ scheme_value df_tcdrain(long nargs, scheme_value *args)
 
 scheme_value df_tcflush(long nargs, scheme_value *args)
 {
-    extern int tcflush(int , int );
+    
     scheme_value ret1;
     int r1;
 
@@ -97,7 +99,7 @@ scheme_value df_tcflush(long nargs, scheme_value *args)
 
 scheme_value df_tcflow(long nargs, scheme_value *args)
 {
-    extern int tcflow(int , int );
+    
     scheme_value ret1;
     int r1;
 
@@ -109,7 +111,7 @@ scheme_value df_tcflow(long nargs, scheme_value *args)
 
 scheme_value df_tcsetpgrp(long nargs, scheme_value *args)
 {
-    extern int tcsetpgrp(int , pid_t );
+    
     scheme_value ret1;
     int r1;
 
@@ -121,7 +123,7 @@ scheme_value df_tcsetpgrp(long nargs, scheme_value *args)
 
 scheme_value df_tcgetpgrp(long nargs, scheme_value *args)
 {
-    extern pid_t tcgetpgrp(int );
+    
     scheme_value ret1;
     pid_t r1;