Compile error in Zephyr, can not find c funtion even include the head fileshttps://devzone.nordicsemi.com/f/nordic-q-a/108075/compile-error-in-zephyr-can-not-find-c-funtion-even-include-the-head-filesHi Support team, I&#39;m compiling some c code with ncs v2.5.1, the include files are: #include &lt;time.h&gt; #include &lt;sys/time.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;stdbool.h&gt; But there are some compiling errors: (1) en-USTelligent Community 13Tue, 06 Feb 2024 08:55:55 GMTRE: Compile error in Zephyr, can not find c funtion even include the head fileshttps://devzone.nordicsemi.com/thread/467696?ContentTypeID=1Tue, 06 Feb 2024 08:55:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8680d8a5-d11c-4c36-93e8-96eace0601baYanpengwu<p>Update: When I config &#39;<span>CONFIG_POSIX_API</span><span>=y</span>&#39;, the error of&nbsp;<span>clock_gettime() disappeared.</span></p> <p><span>But the errors of strdup and&nbsp;strndup still there. I found there is a&nbsp;<a href="https://github.com/zephyrproject-rtos/zephyr/pull/22491">Issue 22464 strdup function added to minimal C library #22491</a>&nbsp;and said the strdup was added into Zephyr. I&#39;m using&nbsp;ncs v2.5.1, should I add some configuration for this?</span></p> <p><span>Thank you very much.</span></p><div style="clear:both;"></div>