diff --git a/cde/lib/DtTerm/TermPrim/TermPrimBuffer.c b/cde/lib/DtTerm/TermPrim/TermPrimBuffer.c
index fbad9c2f9..cb5825fde 100644
--- a/cde/lib/DtTerm/TermPrim/TermPrimBuffer.c
+++ b/cde/lib/DtTerm/TermPrim/TermPrimBuffer.c
@@ -32,6 +32,10 @@
 
 #define	USE_MEMCPY	/* use memcpy for line movement... */
 
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include <stdlib.h>
 #include <wchar.h>
 #include <Xm/Xm.h>
diff --git a/cde/lib/DtTerm/TermPrim/TermPrimBufferWc.c b/cde/lib/DtTerm/TermPrim/TermPrimBufferWc.c
index faf67b12f..a29bcd0ad 100644
--- a/cde/lib/DtTerm/TermPrim/TermPrimBufferWc.c
+++ b/cde/lib/DtTerm/TermPrim/TermPrimBufferWc.c
@@ -32,6 +32,10 @@
 
 #define	USE_MEMCPY	/* use memcpy for line movement... */
 
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include <stdlib.h>
 #include <wchar.h>
 #include <Xm/Xm.h>
diff --git a/cde/lib/DtTerm/TermPrim/TermPrimRenderLineDraw.c b/cde/lib/DtTerm/TermPrim/TermPrimRenderLineDraw.c
index 6c5855343..fccfe721b 100644
--- a/cde/lib/DtTerm/TermPrim/TermPrimRenderLineDraw.c
+++ b/cde/lib/DtTerm/TermPrim/TermPrimRenderLineDraw.c
@@ -27,6 +27,10 @@
  * (c) Copyright 1993, 1994 Novell, Inc.                                *
  */
 
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include <stdlib.h>
 #include <wchar.h>
 
diff --git a/cde/lib/DtTerm/TermPrim/TermPrimRenderMb.c b/cde/lib/DtTerm/TermPrim/TermPrimRenderMb.c
index 3454cfcfc..ece7959e8 100644
--- a/cde/lib/DtTerm/TermPrim/TermPrimRenderMb.c
+++ b/cde/lib/DtTerm/TermPrim/TermPrimRenderMb.c
@@ -34,6 +34,10 @@
 ** This file contains the multi-byte character versions of the render routines.
 */
 
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
 #include "TermHeader.h"
 #include "TermPrimDebug.h"
 #include "TermPrimP.h"
diff --git a/cde/lib/DtTerm/TermPrim/TermPrimSetPty.c b/cde/lib/DtTerm/TermPrim/TermPrimSetPty.c
index 1fa21459e..6e001fe58 100644
--- a/cde/lib/DtTerm/TermPrim/TermPrimSetPty.c
+++ b/cde/lib/DtTerm/TermPrim/TermPrimSetPty.c
@@ -30,9 +30,11 @@
  * (c) Copyright 1996 Hitachi.						*
  */
 
+
 #include "TermHeader.h"
 #include "TermPrimOSDepI.h"
 #include "TermPrimDebug.h"
+
 #include <fcntl.h>
 #ifdef  ALPHA_ARCHITECTURE
 #include <sys/ioctl.h>
@@ -86,6 +88,10 @@
 #include <signal.h>
 #include <Xm/Xm.h>
 
+#include <Dt/Term.h>
+#include "TermPrimUtil.h"
+
+
 #define XTTYMODE_intr    0
 #define XTTYMODE_quit    1
 #define XTTYMODE_erase   2