This file is indexed.

/usr/include/des_conf.h is in libopenafs-dev 1.6.20-2+deb9u2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*
 * Copyright 1988 by the Massachusetts Institute of Technology.
 *
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 *
 * This file contains configuration information for the DES library
 * which is machine specific; currently, this file contains
 * configuration information for the vax, the "ibm032" (RT), and
 * the "PC8086" (IBM PC).
 *
 * Note:  cross-compiled targets must appear BEFORE their corresponding
 * cross-compiler host.  Otherwise, both will be defined when running
 * the native compiler on the programs that construct cross-compiled
 * sources.
 */

#include <afs/param.h>
#include <mit-cpyright.h>

/* Machine-type and OS-type based configuration */

#ifdef PC8086
#define IBMPC
#define BITS16
/* #define BIG */
#define CROSSMSDOS
#define LSBFIRST

#else

#ifdef vax
#define VAX
#ifndef	__STDC__		/* not Berkeley PCC */
#ifndef	__GNU__			/* ditto */
#ifndef	NOASM			/* are we doing C-only? */
#define VAXASM
#endif /* NOASM */
#endif /* __GNU__ */
#endif /* __STDC__ */
#define BITS32
#define BIG
#define BSDUNIX
#define LSBFIRST

#else

#ifdef sun
#define BITS32
#define BIG
#define BSDUNIX
#define MSBFIRST

#else

#ifdef	AFS_AIX_ENV
#define IBMWS
#define IBMWSASM
#define BITS32
#define BIG
#define	BSDUNIX			/*Does it mean the default us S5? NO */
#define MSBFIRST
#define MUSTALIGN
#else
#ifdef multimax
#define BITS32
#define BIG
#define BSDUNIX
#define LSBFIRST
#else

Sorry,
    you lose.
    Figure out what the machine looks like and fix this file to include it.
#endif /* multimax */
#endif /* AFS_AIX_ENV */
#endif /* sun */
#endif /* vax */
#endif /* pc8086 */
/* Language configuration -- are we ANSI or are we Berkeley? */
#ifndef	__STDC__
#define	const
#endif