diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 50807e61b..3e56e1a9a 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2010-10-08  Ralf Corsépius  <ralf.corsepius@rtems.org>
+
+	* libc/include/sys/unistd.h: Declare getsid, setegid, seteuid for RTEMS.
+
 2010-10-08  Ralf Corsépius  <ralf.corsepius@rtems.org>
 
 	* libm/common/sf_llrint.c, libm/common/sf_round.c: Add explicit casts
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index d6d9b41ea..f5c97f87a 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -94,7 +94,7 @@ pid_t   _EXFUN(getpgid, (pid_t));
 pid_t   _EXFUN(getpgrp, (void ));
 pid_t   _EXFUN(getpid, (void ));
 pid_t   _EXFUN(getppid, (void ));
-#ifdef __CYGWIN__
+#if defined(__CYGWIN__) || defined(__rtems__)
 pid_t   _EXFUN(getsid, (pid_t));
 #endif
 #if !defined(__INSIDE_CYGWIN__)
@@ -146,7 +146,7 @@ int	_EXFUN(ruserok, (const char *rhost, int superuser, const char *ruser, const
 #endif
 void *  _EXFUN(sbrk,  (ptrdiff_t __incr));
 #if !defined(__INSIDE_CYGWIN__)
-#if defined(__CYGWIN__)
+#if defined(__CYGWIN__) || defined(__rtems__)
 int     _EXFUN(setegid, (gid_t __gid ));
 int     _EXFUN(seteuid, (uid_t __uid ));
 #endif