R6.6 is the Xorg base-lineXORG-MAINXORG-STABLE

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diff --git a/ifparser.h b/ifparser.h
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+/*
+ * $Xorg: ifparser.h,v 1.3 2000/08/17 19:41:51 cpqbld Exp $
+ *
+ * Copyright 1992 Network Computing Devices, Inc.
+ * 
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Network Computing Devices may not be
+ * used in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  Network Computing Devices makes
+ * no representations about the suitability of this software for any purpose.
+ * It is provided ``as is'' without express or implied warranty.
+ * 
+ * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+ * IN NO EVENT SHALL NETWORK COMPUTING DEVICES BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * Author:  Jim Fulton
+ *          Network Computing Devices, Inc.
+ * 
+ * Simple if statement processor
+ *
+ * This module can be used to evaluate string representations of C language
+ * if constructs.  It accepts the following grammar:
+ * 
+ *     EXPRESSION	:=	VALUE
+ * 			 |	VALUE  BINOP	EXPRESSION
+ * 
+ *     VALUE		:=	'('  EXPRESSION  ')'
+ * 			 |	'!'  VALUE
+ * 			 |	'-'  VALUE
+ * 			 |	'defined'  '('  variable  ')'
+ * 			 |	variable
+ * 			 |	number
+ * 
+ *     BINOP		:=	'*'	|  '/'	|  '%'
+ * 			 |	'+'	|  '-'
+ * 			 |	'<<'	|  '>>'
+ * 			 |	'<'	|  '>'	|  '<='  |  '>='
+ * 			 |	'=='	|  '!='
+ * 			 |	'&'	|  '|'
+ * 			 |	'&&'	|  '||'
+ * 
+ * The normal C order of precidence is supported.
+ * 
+ * 
+ * External Entry Points:
+ * 
+ *     ParseIfExpression		parse a string for #if
+ */
+
+#include <stdio.h>
+
+#define const /**/
+typedef int Bool;
+#define False 0
+#define True 1
+
+typedef struct _if_parser {
+    struct {				/* functions */
+	char *(*handle_error) (/* struct _if_parser *, const char *,
+				 const char * */);
+	long (*eval_variable) (/* struct _if_parser *, const char *, int */);
+	int (*eval_defined) (/* struct _if_parser *, const char *, int */);
+    } funcs;
+    char *data;
+} IfParser;
+
+char *ParseIfExpression (
+#ifdef __STDC__
+    IfParser *, 
+    const char *, 
+    long *
+#endif
+);
+