/usr/include/clips/scanner.h is in libclips-dev 6.24-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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   /*      "C" Language Integrated Production System      */
   /*                                                     */
   /*             CLIPS Version 6.20  01/31/02            */
   /*                                                     */
   /*                 SCANNER HEADER FILE                 */
   /*******************************************************/
/*************************************************************/
/* Purpose: Routines for scanning lexical tokens from an     */
/*   input source.                                           */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Gary D. Riley                                        */
/*                                                           */
/* Contributing Programmer(s):                               */
/*                                                           */
/* Revision History:                                         */
/*                                                           */
/*************************************************************/
#ifndef _H_scanner
#define _H_scanner
struct token;
#ifndef _H_pprint
#include "pprint.h"
#endif
#ifdef LOCALE
#undef LOCALE
#endif
#ifdef _SCANNER_SOURCE_
#define LOCALE
#else
#define LOCALE extern
#endif
struct token
  {
   unsigned short type;
   void *value;
   char *printForm;
  };
#define SCANNER_DATA 57
struct scannerData
  { 
   char *GlobalString;
   unsigned GlobalMax;
   int GlobalPos;
   long LineCount;
   int IgnoreCompletionErrors;
  };
#define ScannerData(theEnv) ((struct scannerData *) GetEnvironmentData(theEnv,SCANNER_DATA))
   LOCALE void                           InitializeScannerData(void *);
   LOCALE void                           GetToken(void *,char *,struct token *);
   LOCALE void                           CopyToken(struct token *,struct token *);
   LOCALE void                           ResetLineCount(void *);
   LOCALE long                           GetLineCount(void *);
   LOCALE void                           IncrementLineCount(void *);
   LOCALE void                           DecrementLineCount(void *);
#endif
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