diff --git a/win/X11/.gitattributes b/win/X11/.gitattributes
new file mode 100644
index 000000000..d9328e86a
--- /dev/null
+++ b/win/X11/.gitattributes
@@ -0,0 +1 @@
+nh??icon  NHSUBST
diff --git a/win/X11/nh32icon b/win/X11/nh32icon
index d867f6c4c..422ad63db 100644
--- a/win/X11/nh32icon
+++ b/win/X11/nh32icon
@@ -1,4 +1,4 @@
-/* NetHack 3.6	nh32icon	$NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$ */
+/* NetHack 3.6	nh32icon	$NHDT-Date: 1446457887 2015/11/02 09:51:27 $  $NHDT-Branch: master $:$NHDT-Revision: 1.10 $ */
 /*	Copyright (C) 1993,1995,2015 by Robert Patrick Rankin		*/
 /* NetHack may be freely redistributed.  See license for details.	*/
 
diff --git a/win/X11/nh56icon b/win/X11/nh56icon
index 543750bbf..69b4e8248 100644
--- a/win/X11/nh56icon
+++ b/win/X11/nh56icon
@@ -1,4 +1,4 @@
-/* NetHack 3.6	nh56icon	$NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$ */
+/* NetHack 3.6	nh56icon	$NHDT-Date: 1446457887 2015/11/02 09:51:27 $  $NHDT-Branch: master $:$NHDT-Revision: 1.9 $ */
 /*	Copyright (c) 1993,1995,2015 by M. Stephenson			*/
 /* NetHack may be freely redistributed.  See license for details.	*/
 
diff --git a/win/X11/nh72icon b/win/X11/nh72icon
index db8e90c50..acc824d01 100644
--- a/win/X11/nh72icon
+++ b/win/X11/nh72icon
@@ -1,4 +1,4 @@
-/* NetHack 3.6	nh72icon	$NHDT-Date$  $NHDT-Branch$:$NHDT-Revision$ */
+/* NetHack 3.6	nh72icon	$NHDT-Date: 1446457888 2015/11/02 09:51:28 $  $NHDT-Branch: master $:$NHDT-Revision: 1.8 $ */
 /*	Copyright (c) 1993 by M. Stephenson				*/
 /* NetHack may be freely redistributed.  See license for details.	*/