--- gforth/struct0x.fs	2007/06/24 21:45:45	1.1
+++ gforth/struct0x.fs	2012/01/02 17:16:52	1.3
@@ -6,7 +6,7 @@
 
 \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License
-\ as published by the Free Software Foundation; either version 2
+\ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.
 
 \ This program is distributed in the hope that it will be useful,
@@ -15,8 +15,7 @@
 \ GNU General Public License for more details.
 
 \ You should have received a copy of the GNU General Public License
-\ along with this program; if not, write to the Free Software
-\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+\ along with this program. If not, see http://www.gnu.org/licenses/.
 
 : +field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
     over if
@@ -26,8 +25,12 @@
     then
     + ;
 
+: extend-structure ( n "name" -- struct-sys n ) \ Gforth
+    \g extend an existing structure
+    >r 0 value lastxt >body r> ;
+
 : begin-structure ( "name" -- struct-sys 0 ) \ X:structures
-    0 value lastxt >body 0 ;
+    0 extend-structure ;
 
 : end-structure ( struct-sys +n -- ) \ X:structures
     swap ! ;