/usr/include/clips/default.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 6.24  06/05/06            */
   /*                                                     */
   /*            DEFAULT ATTRIBUTE HEADER FILE            */
   /*******************************************************/
/*************************************************************/
/* Purpose: Provides functions for parsing the default       */
/*   attribute and determining default values based on       */
/*   slot constraints.                                       */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Gary D. Riley                                        */
/*                                                           */
/* Contributing Programmer(s):                               */
/*                                                           */
/* Revision History:                                         */
/*                                                           */
/*      6.24: Support for deftemplate-slot-default-value     */
/*            function.                                      */ 
/*                                                           */
/*************************************************************/
#ifndef _H_default
#define _H_default
#ifndef _H_constrnt
#include "constrnt.h"
#endif
#ifndef _H_evaluatn
#include "evaluatn.h"
#endif
#ifdef LOCALE
#undef LOCALE
#endif
#ifdef _DEFAULT_SOURCE_
#define LOCALE
#else
#define LOCALE extern
#endif
   LOCALE void                           DeriveDefaultFromConstraints(void *,CONSTRAINT_RECORD *,DATA_OBJECT *,int,int);
   LOCALE struct expr                   *ParseDefault(void *,char *,int,int,int,int *,int *,int *);
#endif
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