diff -ur telnet-bsd-1.2/configure.in telnet-bsd-1.2-fbsd/configure.in
--- telnet-bsd-1.2/configure.in	2005-06-01 17:33:16.000000000 +0200
+++ telnet-bsd-1.2-fbsd/configure.in	2005-08-13 12:14:20.000000000 +0200
@@ -12,6 +12,8 @@
 AC_SUBST(PACKAGE)
 AC_SUBST(VERSION)
 
+AC_CHECK_HEADERS([pty.h])
+
 if test x"$ac_default_prefix" = x"/usr"
 then
 	if test x"${mandir}" = x'${prefix}/man'
diff -ur telnet-bsd-1.2/telnet/commands.c telnet-bsd-1.2-fbsd/telnet/commands.c
--- telnet-bsd-1.2/telnet/commands.c	2005-06-02 10:12:51.000000000 +0200
+++ telnet-bsd-1.2-fbsd/telnet/commands.c	2005-08-13 12:18:14.000000000 +0200
@@ -29,11 +29,13 @@
 
 #include "telnet_locl.h"
 #include <err.h>
+#include <unistd.h>
 
 #if	defined(IPPROTO_IP) && defined(IP_TOS)
 int tos = -1;
 #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */
 
+extern char **environ;
 char *hostname;
 
 typedef int (*intrtn_t) __P ((int, char **));
diff -ur telnet-bsd-1.2/telnet/ring.h telnet-bsd-1.2-fbsd/telnet/ring.h
--- telnet-bsd-1.2/telnet/ring.h	2004-02-13 22:52:55.000000000 +0100
+++ telnet-bsd-1.2-fbsd/telnet/ring.h	2005-08-13 12:10:45.000000000 +0200
@@ -29,6 +29,7 @@
  */
 
 #include <sys/cdefs.h>
+#include <sys/types.h>
 #define P __P
 
 /*
diff -ur telnet-bsd-1.2/telnetd/setproctitle.c telnet-bsd-1.2-fbsd/telnetd/setproctitle.c
--- telnet-bsd-1.2/telnetd/setproctitle.c	2004-02-13 23:18:07.000000000 +0100
+++ telnet-bsd-1.2-fbsd/telnetd/setproctitle.c	2005-08-13 12:25:56.000000000 +0200
@@ -72,6 +72,7 @@
 static char **Argv = NULL;		/* pointer to argument vector */
 static char *LastArgv = NULL;		/* end of argv */
 static char Argv0[128];			/* program name */
+extern char **environ;
 
 void
 initsetproctitle(int argc, char **argv, char **envp)
@@ -86,10 +87,10 @@
 
 	for (i = 0; envp[i] != NULL; i++)
 		continue;
-	__environ = (char **) malloc(sizeof (char *) * (i + 1));
+	environ = (char **) malloc(sizeof (char *) * (i + 1));
 	for (i = 0; envp[i] != NULL; i++)
-		__environ[i] = strdup(envp[i]);
-	__environ[i] = NULL;
+		environ[i] = strdup(envp[i]);
+	environ[i] = NULL;
 
 	/*
 	**  Save start and extent of argv for setproctitle.
diff -ur telnet-bsd-1.2/telnetd/sys_term.c telnet-bsd-1.2-fbsd/telnetd/sys_term.c
--- telnet-bsd-1.2/telnetd/sys_term.c	2005-06-01 13:42:23.000000000 +0200
+++ telnet-bsd-1.2-fbsd/telnetd/sys_term.c	2005-08-13 12:14:30.000000000 +0200
@@ -27,8 +27,13 @@
  * SUCH DAMAGE.
  */
 
+#include <config.h>
+
+#include <sys/types.h>
 #include <utmp.h>
+#ifdef HAVE_PTY_H
 #include <pty.h>
+#endif
 
 #include "telnetd.h"
 #include "pathnames.h"