diff --git a/lang/cem/cemcom.ansi/LLlex.c b/lang/cem/cemcom.ansi/LLlex.c
index 99c678618..9736b4420 100644
--- a/lang/cem/cemcom.ansi/LLlex.c
+++ b/lang/cem/cemcom.ansi/LLlex.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		    L E X I C A L   A N A L Y Z E R			*/
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/LLlex.h b/lang/cem/cemcom.ansi/LLlex.h
index 4e11d1e46..7fb88292d 100644
--- a/lang/cem/cemcom.ansi/LLlex.h
+++ b/lang/cem/cemcom.ansi/LLlex.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* D E F I N I T I O N S   F O R   T H E   L E X I C A L   A N A L Y Z E R */
 
 /*	A token from the input stream is represented by an integer,
diff --git a/lang/cem/cemcom.ansi/LLmessage.c b/lang/cem/cemcom.ansi/LLmessage.c
index 56502271c..4c08480d2 100644
--- a/lang/cem/cemcom.ansi/LLmessage.c
+++ b/lang/cem/cemcom.ansi/LLmessage.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		PARSER ERROR ADMINISTRATION		*/
 
 #include	<alloc.h>
diff --git a/lang/cem/cemcom.ansi/align.h b/lang/cem/cemcom.ansi/align.h
index 858720a9a..1e4ee3f94 100644
--- a/lang/cem/cemcom.ansi/align.h
+++ b/lang/cem/cemcom.ansi/align.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	 A L I G N M E N T   D E F I N I T I O N S	*/
 
 #include "nocross.h"
diff --git a/lang/cem/cemcom.ansi/arith.c b/lang/cem/cemcom.ansi/arith.c
index 7d6368c9a..ed3dc5004 100644
--- a/lang/cem/cemcom.ansi/arith.c
+++ b/lang/cem/cemcom.ansi/arith.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	A R I T H M E T I C   C O N V E R S I O N S	 */
 
 /*	This file contains the routines for the various conversions that
diff --git a/lang/cem/cemcom.ansi/arith.h b/lang/cem/cemcom.ansi/arith.h
index fe42aa8e6..399e2645a 100644
--- a/lang/cem/cemcom.ansi/arith.h
+++ b/lang/cem/cemcom.ansi/arith.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* COMPILER ARITHMETIC */
 
 /*	Normally the compiler does its internal arithmetics in longs
diff --git a/lang/cem/cemcom.ansi/assert.h b/lang/cem/cemcom.ansi/assert.h
index 56ff98436..2210f792a 100644
--- a/lang/cem/cemcom.ansi/assert.h
+++ b/lang/cem/cemcom.ansi/assert.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	 A S S E R T I O N    M A C R O   D E F I N I T I O N		*/
 
 /*	At some points in the program, it must be sure that some condition
diff --git a/lang/cem/cemcom.ansi/atw.h b/lang/cem/cemcom.ansi/atw.h
index e90b126ea..74f0044ed 100644
--- a/lang/cem/cemcom.ansi/atw.h
+++ b/lang/cem/cemcom.ansi/atw.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* Align To Word boundary Definition	*/
 
 #include "sizes.h"
diff --git a/lang/cem/cemcom.ansi/blocks.c b/lang/cem/cemcom.ansi/blocks.c
index e75cfb11e..88c6a49e3 100644
--- a/lang/cem/cemcom.ansi/blocks.c
+++ b/lang/cem/cemcom.ansi/blocks.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	B L O C K   S T O R I N G   A N D   L O A D I N G	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/ch3.c b/lang/cem/cemcom.ansi/ch3.c
index 35930162b..6270dfd4a 100644
--- a/lang/cem/cemcom.ansi/ch3.c
+++ b/lang/cem/cemcom.ansi/ch3.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	S E M A N T I C   A N A L Y S I S -- C H A P T E R  3.3		*/
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/ch3bin.c b/lang/cem/cemcom.ansi/ch3bin.c
index 0d0a01c20..cb30e1087 100644
--- a/lang/cem/cemcom.ansi/ch3bin.c
+++ b/lang/cem/cemcom.ansi/ch3bin.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* SEMANTIC ANALYSIS (CHAPTER 3.3)  --  BINARY OPERATORS */
 
 #include	"botch_free.h"
diff --git a/lang/cem/cemcom.ansi/ch3mon.c b/lang/cem/cemcom.ansi/ch3mon.c
index 7a80b6d58..41b277403 100644
--- a/lang/cem/cemcom.ansi/ch3mon.c
+++ b/lang/cem/cemcom.ansi/ch3mon.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* SEMANTIC ANALYSIS (CHAPTER 3.3) -- MONADIC OPERATORS */
 
 #include	"botch_free.h"
diff --git a/lang/cem/cemcom.ansi/class.h b/lang/cem/cemcom.ansi/class.h
index e3bdcad8c..18c317ff3 100644
--- a/lang/cem/cemcom.ansi/class.h
+++ b/lang/cem/cemcom.ansi/class.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		U S E   O F   C H A R A C T E R   C L A S S E S		*/
 
 /*	As a starter, chars are divided into classes, according to which
diff --git a/lang/cem/cemcom.ansi/code.c b/lang/cem/cemcom.ansi/code.c
index d05696609..6b8f3eba3 100644
--- a/lang/cem/cemcom.ansi/code.c
+++ b/lang/cem/cemcom.ansi/code.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	C O D E - G E N E R A T I N G   R O U T I N E S		*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/code.str b/lang/cem/cemcom.ansi/code.str
index 926fb2567..b818bbea0 100644
--- a/lang/cem/cemcom.ansi/code.str
+++ b/lang/cem/cemcom.ansi/code.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	C O D E - G E N E R A T O R   D E F I N I T I O N S	*/
 
 struct string_cst	{	/* storing string constants */
diff --git a/lang/cem/cemcom.ansi/conversion.c b/lang/cem/cemcom.ansi/conversion.c
index 3adec58fa..6627a30e1 100644
--- a/lang/cem/cemcom.ansi/conversion.c
+++ b/lang/cem/cemcom.ansi/conversion.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	C O N V E R S I O N - C O D E  G E N E R A T O R	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/cstoper.c b/lang/cem/cemcom.ansi/cstoper.c
index d89f4eb95..ddd7bf68f 100644
--- a/lang/cem/cemcom.ansi/cstoper.c
+++ b/lang/cem/cemcom.ansi/cstoper.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	C O N S T A N T   E X P R E S S I O N   H A N D L I N G		*/
 
 #include	"trgt_sizes.h"
diff --git a/lang/cem/cemcom.ansi/dataflow.c b/lang/cem/cemcom.ansi/dataflow.c
index 3eef8d6fa..e6f00abac 100644
--- a/lang/cem/cemcom.ansi/dataflow.c
+++ b/lang/cem/cemcom.ansi/dataflow.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	DATAFLOW ANALYSIS ON C PROGRAMS	*/
 
 /*	Compile the C compiler with flag DATAFLOW.
diff --git a/lang/cem/cemcom.ansi/declar.g b/lang/cem/cemcom.ansi/declar.g
index e9744188b..487f55a7b 100644
--- a/lang/cem/cemcom.ansi/declar.g
+++ b/lang/cem/cemcom.ansi/declar.g
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	DECLARATION SYNTAX PARSER	*/
 
 {
diff --git a/lang/cem/cemcom.ansi/declar.str b/lang/cem/cemcom.ansi/declar.str
index eb38fcf44..884bd97e7 100644
--- a/lang/cem/cemcom.ansi/declar.str
+++ b/lang/cem/cemcom.ansi/declar.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* DEFINITION OF DECLARATOR DESCRIPTORS */
 
 /*	A 'declarator' consists of an idf and a linked list of
diff --git a/lang/cem/cemcom.ansi/declarator.c b/lang/cem/cemcom.ansi/declarator.c
index b90f71495..3d33a83be 100644
--- a/lang/cem/cemcom.ansi/declarator.c
+++ b/lang/cem/cemcom.ansi/declarator.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	D E C L A R A T O R   M A N I P U L A T I O N		*/
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/decspecs.c b/lang/cem/cemcom.ansi/decspecs.c
index f7169dda2..f7093daee 100644
--- a/lang/cem/cemcom.ansi/decspecs.c
+++ b/lang/cem/cemcom.ansi/decspecs.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	D E C L A R A T I O N   S P E C I F I E R   C H E C K I N G	*/
 
 #include	"assert.h"
diff --git a/lang/cem/cemcom.ansi/decspecs.h b/lang/cem/cemcom.ansi/decspecs.h
index 0895f9720..73a4048e2 100644
--- a/lang/cem/cemcom.ansi/decspecs.h
+++ b/lang/cem/cemcom.ansi/decspecs.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* DECLARATION SPECIFIER DEFINITION */
 
 struct decspecs	{
diff --git a/lang/cem/cemcom.ansi/def.str b/lang/cem/cemcom.ansi/def.str
index 2a2cec111..adee48607 100644
--- a/lang/cem/cemcom.ansi/def.str
+++ b/lang/cem/cemcom.ansi/def.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* IDENTIFIER DEFINITION DESCRIPTOR */
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/domacro.c b/lang/cem/cemcom.ansi/domacro.c
index a1c1e5416..61364ca7e 100644
--- a/lang/cem/cemcom.ansi/domacro.c
+++ b/lang/cem/cemcom.ansi/domacro.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PREPROCESSOR: CONTROLLINE INTERPRETER */
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/dumpidf.c b/lang/cem/cemcom.ansi/dumpidf.c
index c9bf8d5c4..18f425f26 100644
--- a/lang/cem/cemcom.ansi/dumpidf.c
+++ b/lang/cem/cemcom.ansi/dumpidf.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	DUMP ROUTINES	*/
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/error.c b/lang/cem/cemcom.ansi/error.c
index ff0f76381..bb849fb47 100644
--- a/lang/cem/cemcom.ansi/error.c
+++ b/lang/cem/cemcom.ansi/error.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	E R R O R   A N D  D I A G N O S T I C   R O U T I N E S	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/estack.str b/lang/cem/cemcom.ansi/estack.str
index e9499779a..b65629ed6 100644
--- a/lang/cem/cemcom.ansi/estack.str
+++ b/lang/cem/cemcom.ansi/estack.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* EXPRESSION STACK */
 /* Used for global initializations */
 struct e_stack {
diff --git a/lang/cem/cemcom.ansi/eval.c b/lang/cem/cemcom.ansi/eval.c
index a037c8f07..b85ae8c09 100644
--- a/lang/cem/cemcom.ansi/eval.c
+++ b/lang/cem/cemcom.ansi/eval.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* EXPRESSION-CODE GENERATOR */
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/expr.c b/lang/cem/cemcom.ansi/expr.c
index 29f3f2a7f..6f0eb2c4f 100644
--- a/lang/cem/cemcom.ansi/expr.c
+++ b/lang/cem/cemcom.ansi/expr.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* EXPRESSION TREE HANDLING */
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/expr.str b/lang/cem/cemcom.ansi/expr.str
index 43f96de4e..b341524ed 100644
--- a/lang/cem/cemcom.ansi/expr.str
+++ b/lang/cem/cemcom.ansi/expr.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* EXPRESSION DESCRIPTOR */
 
 /*	What we want to define is the struct expr, but since it contains
diff --git a/lang/cem/cemcom.ansi/expression.g b/lang/cem/cemcom.ansi/expression.g
index 667bc3051..e80281299 100644
--- a/lang/cem/cemcom.ansi/expression.g
+++ b/lang/cem/cemcom.ansi/expression.g
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	EXPRESSION SYNTAX PARSER	*/
 
 {
diff --git a/lang/cem/cemcom.ansi/field.c b/lang/cem/cemcom.ansi/field.c
index a6fceaa47..3f8c07a57 100644
--- a/lang/cem/cemcom.ansi/field.c
+++ b/lang/cem/cemcom.ansi/field.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	BITFIELD EXPRESSION EVALUATOR	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/field.str b/lang/cem/cemcom.ansi/field.str
index 76fdd5afd..7b4f219a1 100644
--- a/lang/cem/cemcom.ansi/field.str
+++ b/lang/cem/cemcom.ansi/field.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* FIELD DESCRIPTOR */
 
 struct field	{	/* for field specifiers	*/
diff --git a/lang/cem/cemcom.ansi/file_info.h b/lang/cem/cemcom.ansi/file_info.h
index ef2892b4a..e70ee290d 100644
--- a/lang/cem/cemcom.ansi/file_info.h
+++ b/lang/cem/cemcom.ansi/file_info.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* F I L E   I N F O R M A T I O N   S T R U C T U R E */
 
 struct file_info {
diff --git a/lang/cem/cemcom.ansi/fltcstoper.c b/lang/cem/cemcom.ansi/fltcstoper.c
index 19a7508db..8ac330df7 100644
--- a/lang/cem/cemcom.ansi/fltcstoper.c
+++ b/lang/cem/cemcom.ansi/fltcstoper.c
@@ -2,7 +2,7 @@
  * (c) copyright 1989 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	C O N S T A N T   E X P R E S S I O N   H A N D L I N G		*/
 /*	  F O R   F L O A T I N G   P O I N T   N U M B E R S		*/
 
diff --git a/lang/cem/cemcom.ansi/idf.c b/lang/cem/cemcom.ansi/idf.c
index 85db5054d..1e6fa244e 100644
--- a/lang/cem/cemcom.ansi/idf.c
+++ b/lang/cem/cemcom.ansi/idf.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	IDENTIFIER  FIDDLING & SYMBOL TABLE HANDLING	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/idf.str b/lang/cem/cemcom.ansi/idf.str
index bdf8d3f80..c4d01ea4b 100644
--- a/lang/cem/cemcom.ansi/idf.str
+++ b/lang/cem/cemcom.ansi/idf.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* IDENTIFIER DESCRIPTOR */
 
 #include	"nopp.h"
diff --git a/lang/cem/cemcom.ansi/init.c b/lang/cem/cemcom.ansi/init.c
index 585db7fa2..bc97dae64 100644
--- a/lang/cem/cemcom.ansi/init.c
+++ b/lang/cem/cemcom.ansi/init.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PREPROCESSOR: INITIALIZATION ROUTINES */
 
 #include	"nopp.h"
diff --git a/lang/cem/cemcom.ansi/input.c b/lang/cem/cemcom.ansi/input.c
index c56f48cdc..5080aab8b 100644
--- a/lang/cem/cemcom.ansi/input.c
+++ b/lang/cem/cemcom.ansi/input.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 
 #include "inputtype.h"
 #include "file_info.h"
diff --git a/lang/cem/cemcom.ansi/input.h b/lang/cem/cemcom.ansi/input.h
index 47d7207c9..972eaf2f6 100644
--- a/lang/cem/cemcom.ansi/input.h
+++ b/lang/cem/cemcom.ansi/input.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 #define INP_PUSHBACK 3
 
 #include <inp_pkg.spec>
diff --git a/lang/cem/cemcom.ansi/interface.h b/lang/cem/cemcom.ansi/interface.h
index 4abd01b21..4967e557e 100644
--- a/lang/cem/cemcom.ansi/interface.h
+++ b/lang/cem/cemcom.ansi/interface.h
@@ -1,4 +1,4 @@
-/* $Header$ */
+/* $Id$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/lang/cem/cemcom.ansi/ival.g b/lang/cem/cemcom.ansi/ival.g
index 4296be953..e7fb3d3f6 100644
--- a/lang/cem/cemcom.ansi/ival.g
+++ b/lang/cem/cemcom.ansi/ival.g
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* CODE FOR THE INITIALISATION OF GLOBAL VARIABLES */
 
 {
diff --git a/lang/cem/cemcom.ansi/l_brace.str b/lang/cem/cemcom.ansi/l_brace.str
index 2e7b71da3..f07471496 100644
--- a/lang/cem/cemcom.ansi/l_brace.str
+++ b/lang/cem/cemcom.ansi/l_brace.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 
 /*	To determine the minimum scope of a local variable, all (braced)
 	scopes are numbered consecutively.  Next we maintain an array which
diff --git a/lang/cem/cemcom.ansi/l_class.h b/lang/cem/cemcom.ansi/l_class.h
index 9f416b25d..d1539d946 100644
--- a/lang/cem/cemcom.ansi/l_class.h
+++ b/lang/cem/cemcom.ansi/l_class.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 
 /*	Lint class constants	*/
 
diff --git a/lang/cem/cemcom.ansi/l_comment.c b/lang/cem/cemcom.ansi/l_comment.c
index d5de417a4..da9d2b776 100644
--- a/lang/cem/cemcom.ansi/l_comment.c
+++ b/lang/cem/cemcom.ansi/l_comment.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint-specific comment handling	*/
 
 #include	<ctype.h>
diff --git a/lang/cem/cemcom.ansi/l_comment.h b/lang/cem/cemcom.ansi/l_comment.h
index 9340b0820..047f2a9f2 100644
--- a/lang/cem/cemcom.ansi/l_comment.h
+++ b/lang/cem/cemcom.ansi/l_comment.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 
 extern int LINTLIB;			/* file is lint library */
 extern int s_NOTREACHED;		/* statement not reached */
diff --git a/lang/cem/cemcom.ansi/l_em.h b/lang/cem/cemcom.ansi/l_em.h
index 02e7a3490..5c0b90a41 100644
--- a/lang/cem/cemcom.ansi/l_em.h
+++ b/lang/cem/cemcom.ansi/l_em.h
@@ -2,7 +2,7 @@
  * (c) copyright 1990 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 
 /*
  * This file can be considered the em_code.h file of lint.
diff --git a/lang/cem/cemcom.ansi/l_ev_ord.c b/lang/cem/cemcom.ansi/l_ev_ord.c
index 4eee840af..56515ebb0 100644
--- a/lang/cem/cemcom.ansi/l_ev_ord.c
+++ b/lang/cem/cemcom.ansi/l_ev_ord.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint evaluation order checking	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/l_lint.c b/lang/cem/cemcom.ansi/l_lint.c
index 48fe06d97..497d7bd64 100644
--- a/lang/cem/cemcom.ansi/l_lint.c
+++ b/lang/cem/cemcom.ansi/l_lint.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint main routines	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/l_lint.h b/lang/cem/cemcom.ansi/l_lint.h
index 0bdffde22..362954ed3 100644
--- a/lang/cem/cemcom.ansi/l_lint.h
+++ b/lang/cem/cemcom.ansi/l_lint.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	LINT FLAGS	*/
 
 #define	USED		0
diff --git a/lang/cem/cemcom.ansi/l_misc.c b/lang/cem/cemcom.ansi/l_misc.c
index 6f900fd78..5e8cd080d 100644
--- a/lang/cem/cemcom.ansi/l_misc.c
+++ b/lang/cem/cemcom.ansi/l_misc.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint miscellaneous routines	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/l_outdef.c b/lang/cem/cemcom.ansi/l_outdef.c
index dae7b5181..3df813be5 100644
--- a/lang/cem/cemcom.ansi/l_outdef.c
+++ b/lang/cem/cemcom.ansi/l_outdef.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint outdef construction	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/l_outdef.str b/lang/cem/cemcom.ansi/l_outdef.str
index 01a006c77..d7494ddad 100644
--- a/lang/cem/cemcom.ansi/l_outdef.str
+++ b/lang/cem/cemcom.ansi/l_outdef.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint output definition	*/
 
 /* Values for ar_class */
diff --git a/lang/cem/cemcom.ansi/l_state.str b/lang/cem/cemcom.ansi/l_state.str
index 5f8f1b281..610e74d96 100644
--- a/lang/cem/cemcom.ansi/l_state.str
+++ b/lang/cem/cemcom.ansi/l_state.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint state stack	*/
 
 /* These datastructures are used to implement a stack on which the
diff --git a/lang/cem/cemcom.ansi/l_states.c b/lang/cem/cemcom.ansi/l_states.c
index 47752a5ac..99e1a4971 100644
--- a/lang/cem/cemcom.ansi/l_states.c
+++ b/lang/cem/cemcom.ansi/l_states.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	Lint status checking	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/label.c b/lang/cem/cemcom.ansi/label.c
index 242ccaebc..643000452 100644
--- a/lang/cem/cemcom.ansi/label.c
+++ b/lang/cem/cemcom.ansi/label.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		L A B E L   H A N D L I N G		*/
 
 #include	"Lpars.h"
diff --git a/lang/cem/cemcom.ansi/label.h b/lang/cem/cemcom.ansi/label.h
index 16e1bf720..629577db2 100644
--- a/lang/cem/cemcom.ansi/label.h
+++ b/lang/cem/cemcom.ansi/label.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		L A B E L   D E F I N I T I O N				*/
 
 #include <em_label.h>		/* obtain definition of "label" */
diff --git a/lang/cem/cemcom.ansi/level.h b/lang/cem/cemcom.ansi/level.h
index 9cf119e14..70ac7453f 100644
--- a/lang/cem/cemcom.ansi/level.h
+++ b/lang/cem/cemcom.ansi/level.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*  LEVEL DEFINITIONS */
 
 /*	The level of the top-most stack_level is kept in a global variable
diff --git a/lang/cem/cemcom.ansi/macro.str b/lang/cem/cemcom.ansi/macro.str
index 9e6af2227..1414741c4 100644
--- a/lang/cem/cemcom.ansi/macro.str
+++ b/lang/cem/cemcom.ansi/macro.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PREPROCESSOR: DEFINITION OF MACRO DESCRIPTOR */
 
 #include	"nopp.h"
diff --git a/lang/cem/cemcom.ansi/main.c b/lang/cem/cemcom.ansi/main.c
index 3de7f6e3d..2746e561b 100644
--- a/lang/cem/cemcom.ansi/main.c
+++ b/lang/cem/cemcom.ansi/main.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* MAIN PROGRAM */
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/make.tokcase b/lang/cem/cemcom.ansi/make.tokcase
index 56d104ae2..a500239d4 100755
--- a/lang/cem/cemcom.ansi/make.tokcase
+++ b/lang/cem/cemcom.ansi/make.tokcase
@@ -1,6 +1,6 @@
 cat <<'--EOT--'
 /* Generated by make.tokcase */
-/* $Header$ */
+/* $Id$ */
 #include "Lpars.h"
 
 char *
diff --git a/lang/cem/cemcom.ansi/make.tokfile b/lang/cem/cemcom.ansi/make.tokfile
index 26381e13f..f1d1273bc 100755
--- a/lang/cem/cemcom.ansi/make.tokfile
+++ b/lang/cem/cemcom.ansi/make.tokfile
@@ -1,6 +1,6 @@
 cat <<'--EOT--'
 /* Generated by make.tokfile */
-/* $Header$ */
+/* $Id$ */
 --EOT--
 
 sed '
diff --git a/lang/cem/cemcom.ansi/mes.h b/lang/cem/cemcom.ansi/mes.h
index 49b856b3a..173d00460 100644
--- a/lang/cem/cemcom.ansi/mes.h
+++ b/lang/cem/cemcom.ansi/mes.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* MESSAGE ADMINISTRATION */
 
 extern int fp_used;	/* code.c	*/
diff --git a/lang/cem/cemcom.ansi/options.c b/lang/cem/cemcom.ansi/options.c
index bbb9318f2..c7298d525 100644
--- a/lang/cem/cemcom.ansi/options.c
+++ b/lang/cem/cemcom.ansi/options.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	U S E R   O P T I O N - H A N D L I N G		*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/pragma.c b/lang/cem/cemcom.ansi/pragma.c
index 1849dbcf4..92739dd9a 100644
--- a/lang/cem/cemcom.ansi/pragma.c
+++ b/lang/cem/cemcom.ansi/pragma.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PREPROCESSOR: PRAGMA INTERPRETER */
 
 #include	"debug.h"
diff --git a/lang/cem/cemcom.ansi/program.g b/lang/cem/cemcom.ansi/program.g
index 1c1a8047c..937effab6 100644
--- a/lang/cem/cemcom.ansi/program.g
+++ b/lang/cem/cemcom.ansi/program.g
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PROGRAM PARSER */
 
 /*	The presence of typedef declarations renders it impossible to
diff --git a/lang/cem/cemcom.ansi/proto.c b/lang/cem/cemcom.ansi/proto.c
index 3e236c3a9..e1ff73a5e 100644
--- a/lang/cem/cemcom.ansi/proto.c
+++ b/lang/cem/cemcom.ansi/proto.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*  P R O T O T Y P E   F I D D L I N G  */
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/proto.main b/lang/cem/cemcom.ansi/proto.main
index 4116113be..a8f9e029c 100644
--- a/lang/cem/cemcom.ansi/proto.main
+++ b/lang/cem/cemcom.ansi/proto.main
@@ -1,4 +1,4 @@
-# $Header$
+# $Id$
 
 # C compilation part. Not to be called directly.
 # Instead, it is to be called by the Makefile.
diff --git a/lang/cem/cemcom.ansi/proto.make b/lang/cem/cemcom.ansi/proto.make
index 2ac31ba80..ea6197698 100644
--- a/lang/cem/cemcom.ansi/proto.make
+++ b/lang/cem/cemcom.ansi/proto.make
@@ -1,4 +1,4 @@
-# $Header$
+# $Id$
 
 # make ANSI C compiler
 
diff --git a/lang/cem/cemcom.ansi/proto.str b/lang/cem/cemcom.ansi/proto.str
index 6bdf4ca97..03219deee 100644
--- a/lang/cem/cemcom.ansi/proto.str
+++ b/lang/cem/cemcom.ansi/proto.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PARAMETER TYPE LIST DEFINITION */
 
 struct proto {
diff --git a/lang/cem/cemcom.ansi/replace.c b/lang/cem/cemcom.ansi/replace.c
index 298eab952..b5983c7df 100644
--- a/lang/cem/cemcom.ansi/replace.c
+++ b/lang/cem/cemcom.ansi/replace.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*  M A C R O   R E P L A C E M E N T */
 #include	"nopp.h"
 
diff --git a/lang/cem/cemcom.ansi/replace.str b/lang/cem/cemcom.ansi/replace.str
index 06948a16f..d936fe31d 100644
--- a/lang/cem/cemcom.ansi/replace.str
+++ b/lang/cem/cemcom.ansi/replace.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	DEFINITIONS FOR THE MACRO REPLACEMENT ROUTINES		*/
 
 struct repl {
diff --git a/lang/cem/cemcom.ansi/sizes.h b/lang/cem/cemcom.ansi/sizes.h
index aa3aaa826..69785fd04 100644
--- a/lang/cem/cemcom.ansi/sizes.h
+++ b/lang/cem/cemcom.ansi/sizes.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* VARIOUS TARGET MACHINE SIZE DESCRIPTORS */
 
 #include "nocross.h"
diff --git a/lang/cem/cemcom.ansi/skip.c b/lang/cem/cemcom.ansi/skip.c
index 85664a1f5..f96878a74 100644
--- a/lang/cem/cemcom.ansi/skip.c
+++ b/lang/cem/cemcom.ansi/skip.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* PREPROCESSOR: INPUT SKIP FUNCTIONS */
 
 #include	"nopp.h"
diff --git a/lang/cem/cemcom.ansi/specials.h b/lang/cem/cemcom.ansi/specials.h
index f086845bd..947d1c7a1 100644
--- a/lang/cem/cemcom.ansi/specials.h
+++ b/lang/cem/cemcom.ansi/specials.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* OCCURANCES OF SPECIAL IDENTIFIERS */
 
 #define	SP_SETJMP	1
diff --git a/lang/cem/cemcom.ansi/stab.c b/lang/cem/cemcom.ansi/stab.c
index f8e25b6c3..401d91b40 100644
--- a/lang/cem/cemcom.ansi/stab.c
+++ b/lang/cem/cemcom.ansi/stab.c
@@ -7,7 +7,7 @@
 
 /* D E B U G G E R   S Y M B O L   T A B L E */
 
-/* $Header$ */
+/* $Id$ */
 
 #include	"dbsymtab.h"
 
diff --git a/lang/cem/cemcom.ansi/stack.c b/lang/cem/cemcom.ansi/stack.c
index 55ca14553..b0cf97cab 100644
--- a/lang/cem/cemcom.ansi/stack.c
+++ b/lang/cem/cemcom.ansi/stack.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	S T A C K / U N S T A C K  R O U T I N E S	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/stack.str b/lang/cem/cemcom.ansi/stack.str
index fd7e76d76..ddb38c56c 100644
--- a/lang/cem/cemcom.ansi/stack.str
+++ b/lang/cem/cemcom.ansi/stack.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* IDENTIFIER STACK DEFINITIONS */
 
 /*	The identifier stack is implemented as a stack of sets.
diff --git a/lang/cem/cemcom.ansi/statement.g b/lang/cem/cemcom.ansi/statement.g
index b8f6ecad3..97fd969cc 100644
--- a/lang/cem/cemcom.ansi/statement.g
+++ b/lang/cem/cemcom.ansi/statement.g
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	STATEMENT SYNTAX PARSER	*/
 
 {
diff --git a/lang/cem/cemcom.ansi/stb.c b/lang/cem/cemcom.ansi/stb.c
index ca20cfd76..0a98e6725 100644
--- a/lang/cem/cemcom.ansi/stb.c
+++ b/lang/cem/cemcom.ansi/stb.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* library routine for copying structs */
 
 __stb(n, f, t)
diff --git a/lang/cem/cemcom.ansi/stmt.str b/lang/cem/cemcom.ansi/stmt.str
index a5f47680e..feaa82fcd 100644
--- a/lang/cem/cemcom.ansi/stmt.str
+++ b/lang/cem/cemcom.ansi/stmt.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	S T A T E M E N T - B L O C K   D E F I N I T I O N S	*/
 
 struct stmt_block	{
diff --git a/lang/cem/cemcom.ansi/struct.c b/lang/cem/cemcom.ansi/struct.c
index ce3586251..805df0ba5 100644
--- a/lang/cem/cemcom.ansi/struct.c
+++ b/lang/cem/cemcom.ansi/struct.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	ADMINISTRATION OF STRUCT AND UNION DECLARATIONS	*/
 
 #include	"nobitfield.h"
diff --git a/lang/cem/cemcom.ansi/struct.str b/lang/cem/cemcom.ansi/struct.str
index 1e41050f6..8dafd856e 100644
--- a/lang/cem/cemcom.ansi/struct.str
+++ b/lang/cem/cemcom.ansi/struct.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* SELECTOR DESCRIPTOR */
 
 struct sdef	{		/* for selectors */
diff --git a/lang/cem/cemcom.ansi/switch.c b/lang/cem/cemcom.ansi/switch.c
index ad3efdb1f..bd7b37a49 100644
--- a/lang/cem/cemcom.ansi/switch.c
+++ b/lang/cem/cemcom.ansi/switch.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	S W I T C H - S T A T E M E N T  A D M I N I S T R A T I O N	*/
 
 #include	"lint.h"
diff --git a/lang/cem/cemcom.ansi/switch.str b/lang/cem/cemcom.ansi/switch.str
index a8c118f2c..fd2dd455b 100644
--- a/lang/cem/cemcom.ansi/switch.str
+++ b/lang/cem/cemcom.ansi/switch.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*		S W I T C H - T A B L E - S T R U C T U R E		*/
 
 struct switch_hdr	{
diff --git a/lang/cem/cemcom.ansi/tokenname.c b/lang/cem/cemcom.ansi/tokenname.c
index 875ead5f3..75e593174 100644
--- a/lang/cem/cemcom.ansi/tokenname.c
+++ b/lang/cem/cemcom.ansi/tokenname.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* TOKEN NAME DEFINITIONS */
 
 #include	"idf.h"
diff --git a/lang/cem/cemcom.ansi/tokenname.h b/lang/cem/cemcom.ansi/tokenname.h
index bd883f1bc..fdff2fbc2 100644
--- a/lang/cem/cemcom.ansi/tokenname.h
+++ b/lang/cem/cemcom.ansi/tokenname.h
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* TOKENNAME DEFINITION */
 
 struct tokenname	{	/*	Used for defining the name of a
diff --git a/lang/cem/cemcom.ansi/type.c b/lang/cem/cemcom.ansi/type.c
index d78de8640..ef0d2cdf0 100644
--- a/lang/cem/cemcom.ansi/type.c
+++ b/lang/cem/cemcom.ansi/type.c
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /*	T Y P E   D E F I N I T I O N   M E C H A N I S M	 */
 
 #include	"nobitfield.h"
diff --git a/lang/cem/cemcom.ansi/type.str b/lang/cem/cemcom.ansi/type.str
index 4f5ef360b..c1c6205d6 100644
--- a/lang/cem/cemcom.ansi/type.str
+++ b/lang/cem/cemcom.ansi/type.str
@@ -2,7 +2,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-/* $Header$ */
+/* $Id$ */
 /* TYPE DESCRIPTOR */
 
 #include	"nobitfield.h"
diff --git a/lang/cem/cemcom.ansi/util.c b/lang/cem/cemcom.ansi/util.c
index 9f51de24e..9b9d1151c 100644
--- a/lang/cem/cemcom.ansi/util.c
+++ b/lang/cem/cemcom.ansi/util.c
@@ -5,7 +5,7 @@
 
 /* M I S C E L L A N E O U S   U T I L I T I E S */
 
-/* $Header$ */
+/* $Id$ */
 
 /*	Code for the allocation and de-allocation of temporary variables,
 	allowing re-use.