This file is indexed.

/usr/lib/bcc/include/features.h is in elks-libc 0.16.17-3.1ubuntu2.

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The actual contents of the file can be viewed below.

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#ifndef __FEATURES_H
#define __FEATURES_H

#ifdef __STDC__

#define __P(x) x
#define __const const

/* Not really ansi */
#ifdef __BCC__
#define const
#define volatile
#endif

#else /* K&R */

#define __P(x) ()
#define __const
#define const
#define volatile

#endif

/* Pick an OS sysinclude directory */
/* Use with #include __SYSINC__(errno.h) */

#ifdef __ELKS__
#define __SYSINC__(_h_file_) <linuxmt/_h_file_>
#endif

#ifdef __linux__
#undef linux	/* Eyuk! */
#define __SYSINC__(_h_file_) <linux/_h_file_>
#endif

#ifdef __MSDOS__
#define __SYSINC__(_h_file_) <msdos/_h_file_>
#endif

#ifndef __SYSINC__
#define __SYSINC__(_h_file_) <generic/_h_file_>
#endif

/* No C++ */
#define __BEGIN_DECLS
#define __END_DECLS

/* GNUish things */
#define __CONSTVALUE
#define __CONSTVALUE2

#include <sys/cdefs.h>

#endif