This file is indexed.

/usr/include/net-snmp/system/linux.h is in libsnmp-dev 5.7.2~dfsg-8.1ubuntu3.

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The actual contents of the file can be viewed below.

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#include "sysv.h"

#define NETSNMP_DONT_USE_NLIST 1

#undef NPROC_SYMBOL

#undef bsdlike

#define ARP_SCAN_FOUR_ARGUMENTS

/* uncomment this to read process names from /proc/X/cmdline (like <= 5.0) */
/* #define USE_PROC_CMDLINE */

/*
 * red hat >= 5.0 doesn't have this 
 */
#ifndef MNTTYPE_PROC
#define MNTTYPE_PROC "proc"
#endif

/* define the extra mib modules that are supported */
#define NETSNMP_INCLUDE_HOST_RESOURCES
#define NETSNMP_INCLUDE_IFTABLE_REWRITES