/usr/include/dparser/lex.h is in mcrl2 201210.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | /*
  Copyright 2002-2004 John Plevyak, All Rights Reserved
*/
#ifndef _lex_H_
#define _lex_H_
/* #define LIVE_DIFF_IN_TRANSITIONS */
struct Grammar;
typedef struct ScanStateTransition {
  uint			index;
  VecAction		live_diff;
  VecAction		accepts_diff;
} ScanStateTransition;
typedef struct ScanState {
  uint			index;
  struct ScanState 	*chars[256];
  VecAction		accepts;
  VecAction		live;
  ScanStateTransition	*transition[256];
} ScanState;
void build_scanners(struct Grammar *g);
#endif
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