https://sourceforge.net/tracker/?func=detail&aid=3071706&group_id=13179&atid=113179
--- a/configure.in
+++ b/configure.in
@@ -133,6 +133,8 @@ AC_CHECK_HEADER(sys/fcntl.h,     AC_DEFINE(HAVE_SYS_FCNTL_H))
 AC_CHECK_HEADER(sys/ptem.h,      AC_DEFINE(HAVE_SYS_PTEM_H))
 AC_CHECK_HEADER(sys/strredir.h,  AC_DEFINE(HAVE_STRREDIR_H))
 AC_CHECK_HEADER(sys/strpty.h,    AC_DEFINE(HAVE_STRPTY_H))
+AC_CHECK_HEADER(pty.h,           AC_DEFINE(HAVE_PTY_H))
+AC_CHECK_HEADER(libutil.h,       AC_DEFINE(HAVE_LIBUTIL_H))
 
 AC_MSG_CHECKING([for sys/bsdtypes.h])
 if test "ISC_${ISC}" = "ISC_1"   ;    then
--- a/exp_clib.c
+++ b/exp_clib.c
@@ -15,6 +15,12 @@
 #endif
 #include <sys/types.h>
 #include <sys/ioctl.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
 
 #ifdef TIME_WITH_SYS_TIME
 # include <sys/time.h>
--- a/exp_trap.c
+++ b/exp_trap.c
@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <signal.h>
 #include <sys/types.h>
+#include <string.h>
 
 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
--- a/pty_termios.c
+++ b/pty_termios.c
@@ -9,6 +9,14 @@
 
 #include <stdio.h>
 #include <signal.h>
+#include <string.h>
+#ifdef HAVE_PTY_H
+#include <pty.h>
+#endif
+#ifdef HAVE_LIBUTIL_H
+#include <sys/types.h>
+#include <libutil.h>
+#endif
 
 #if defined(SIGCLD) && !defined(SIGCHLD)
 #define SIGCHLD SIGCLD
@@ -100,6 +100,7 @@
 
 #include "exp_tty_in.h"
 #include "exp_rename.h"
+#include "exp_int.h"
 #include "exp_pty.h"
 
 void expDiagLog();
--- a/exp_chan.c
+++ b/exp_chan.c
@@ -34,6 +34,7 @@
 #include "exp_rename.h"
 #include "exp_prog.h"
 #include "exp_command.h"
+#include "exp_event.h"
 #include "exp_log.h"
 #include "tcldbg.h" /* Dbg_StdinMode */
 
--- a/exp_clib.c
+++ b/exp_clib.c
@@ -1955,6 +1955,7 @@
 
 #include "expect.h"
 #include "exp_int.h"
+EXTERN void		exp_init_tty _ANSI_ARGS_((void));
 
 /* exp_glob.c - expect functions for doing glob
  *
--- a/exp_tty.h
+++ b/exp_tty.h
@@ -17,6 +17,7 @@
 
 void exp_tty_raw(int set);
 void exp_tty_echo(int set);
+int exp_tty_cooked_echo(Tcl_Interp *interp, exp_tty *tty_old, int *was_raw, int *was_echo);
 void exp_tty_break(Tcl_Interp *interp, int fd);
 int exp_tty_raw_noecho(Tcl_Interp *interp, exp_tty *tty_old, int *was_raw, int *was_echo);
 int exp_israw(void);