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I want to find the utmp.h, but there are two different virsion

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    Open those files, you can see this #error "Never include <bits/utmp.h> directly; use <utmp.h> instead.". – Biswapriyo Apr 27 at 5:29
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The header files in /usr/include/x86_64-linux-gnu/bits/ are included by a corresponding header in /usr/include/. If I open up /usr/include/utmp.h on my machine and go to lines 28 and 29, I'll find:

/* Get system dependent values and data structures.  */
#include <bits/utmp.h>

This means that the bits headers are used to define data structures and preprocessor macros that differ between systems. These definitions can then be used by the standard /usr/include headers, instead of having to create and distribute different /usr/include headers for every possible system configuration.

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