This file is indexed.

/usr/lib/bcc/include/bsd/tzfile.h is in elks-libc 0.16.17-3.3.

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#ifndef _BSD_TZFILE_H
#define _BSD_TZFILE_H

#define SECSPERDAY	(60*60*24)
#define DAYSPERNYEAR	365
#define DAYSPERLYEAR    366

#define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)

#endif /* _BSD_TZFILE_H */