Index: src/Makefile.in
--- src/Makefile.in.orig	2014-01-23 00:27:08.000000000 +0100
+++ src/Makefile.in	2016-02-28 20:07:40.142551034 +0100
@@ -483,7 +483,7 @@
 
 install-sudosh.conf:
 	test -z "$(sysconfdir)" || $(mkdir_p) "$(DESTDIR)$(sysconfdir)"
-	test -f $(sysconfdir)/sudosh.conf || $(INSTALL) -o 0 -g 0 -m 0444 '$(srcdir)/sudosh.conf' '$(sysconfdir)/sudosh.conf'
+	test -f $(sysconfdir)/sudosh.conf || $(INSTALL) -m 0444 '$(srcdir)/sudosh.conf' '$(sysconfdir)/sudosh.conf'
 
 install: install-am install-sudosh.conf
 
Index: src/getopt.c
--- src/getopt.c.orig	2014-01-23 00:11:58.000000000 +0100
+++ src/getopt.c	2016-02-28 20:07:40.142551034 +0100
@@ -37,6 +37,8 @@
 #include "config.h"
 #endif
 
+#include <string.h>
+
 #ifndef __STDC__
 /* This is a separate conditional since some stdc systems
    reject `defined (const)'.  */
Index: src/sudosh.c
--- src/sudosh.c.orig	2014-01-23 00:30:10.000000000 +0100
+++ src/sudosh.c	2016-02-28 20:07:40.153431816 +0100
@@ -28,6 +28,13 @@
 
 #define WRITE(a, b, c) do_write(a, b, c, __FILE__, __LINE__)
 
+#ifdef __FreeBSD__
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <libutil.h>
+#include <sys/param.h>
+#endif
+
 static struct termios termorig;
 static struct winsize winorig;
 
@@ -529,19 +536,43 @@
 {
   char *sname;
 
+#ifdef __FreeBSD__
+#define PTYLEN        16
+  char sname_area[PTYLEN];
+  struct termios tt;
+  struct winsize win;
+
+  sname = sname_area;
+  if (tcgetattr(STDIN_FILENO, &tt) == -1)
+    {
+      perror ("tcgetattr");
+      return -1;
+    }
+  if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) == -1)
+    {
+      perror ("ioctl");
+      return -1;
+    }
+    if (openpty(&p->mfd, &p->sfd, sname, &tt, &win) == -1) {
+#else
   if ((p->mfd = open ("/dev/ptmx", O_RDWR)) == -1)
     {
       if ((p->mfd = open ("/dev/ptc", O_RDWR)) == -1)
 	{
+#endif
 	  perror ("Cannot open cloning master pty");
 	  return -1;
+#ifndef __FreeBSD__
 	}
+#endif
     }
 
+#if !defined(__FreeBSD_version) || (defined(__FreeBSD_version) && __FreeBSD_version >= 500000)
   (void) unlockpt (p->mfd);
   (void) grantpt (p->mfd);
 
   sname = (char *) ptsname (p->mfd);
+#endif
 
   if ((p->sfd = open (sname, O_RDWR)) == -1)
     {
@@ -601,9 +632,14 @@
   for (i = 3; i < 100; ++i)
     close (i);
 
+#ifdef __FreeBSD__
+  (void) tcsetattr(0, TCSADRAIN, &termorig);
+  (void) login_tty(pst->sfd);
+#else
 #ifdef TCSETS
   (void) ioctl (0, TCSETS, &termorig);
 #endif
+#endif
   (void) ioctl (0, TIOCSWINSZ, &winorig);
 
   if (setuid (getuid ())!=0)
@@ -653,6 +689,13 @@
 {
   static struct termios termnew;
 
+#ifdef __FreeBSD__
+  if (tcgetattr(ttyfd, &termorig) == -1)
+    {
+      perror ("tcgetattr failed");
+      exit (EXIT_FAILURE);
+    }
+#else
 #ifdef TCGETS
   if (ioctl (ttyfd, TCGETS, &termorig) == -1)
     {
@@ -660,6 +703,7 @@
       exit (EXIT_FAILURE);
     }
 #endif
+#endif
 
   if (ioctl (ttyfd, TIOCGWINSZ, &winorig) == -1)
     {
@@ -667,6 +711,11 @@
       exit (EXIT_FAILURE);
     }
 
+#ifdef __FreeBSD__
+  (void) cfmakeraw(&termnew);
+  termnew.c_lflag &= ~ECHO;
+  (void) tcsetattr(ttyfd, TCSAFLUSH, &termnew);
+#else
   termnew.c_cc[VEOF] = 1;
   termnew.c_iflag = BRKINT | ISTRIP | IXON | IXANY;
   termnew.c_oflag = 0;
@@ -676,14 +725,20 @@
 #ifdef TCSETS
   (void) ioctl (ttyfd, TCSETS, &termnew);
 #endif
+#endif
 }
 
 static void
 bye (int signum)
 {
+
+#ifdef __FreeBSD__
+  (void) tcsetattr(0, TCSADRAIN, &termorig);
+#else
 #ifdef TCSETS
   (void) ioctl (0, TCSETS, &termorig);
 #endif
+#endif
 
   close (timing.fd);
   close (script.fd);
