https://devzone.nordicsemi.com/f/nordic-q-a/100357/ncs-how-to-add-and-use-the-header-file-in-the-libraryIf I want to use the header file in the library,what should I do next? For example, I want to add this to main.c. #include &lt;app_event_manager.h&gt;en-USTelligent Community 13Fri, 02 Jun 2023 09:12:21 GMThttps://devzone.nordicsemi.com/thread/428945?ContentTypeID=1Fri, 02 Jun 2023 09:12:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae7e083a-3725-4a9d-b2c8-eb72ef45ef0brunsiv<p>Glad to hear it&nbsp;<span>Kenlove. I will close this case</span></p> <p><span>Have a wonderfull weekend</span></p> <p><span>Regards</span></p> <p><span>Runar</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/428943?ContentTypeID=1Fri, 02 Jun 2023 09:09:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c468794b-bc75-48c7-a6bb-9a5f73e27e4akenlove<p><span>&nbsp;Thank you very much!&nbsp;</span><span class="select-trans" data-tab="usual" data-pos="trans_yiwen">The</span><span>&nbsp;</span><span class="select-trans" data-tab="usual" data-pos="trans_yiwen">problem</span><span>&nbsp;</span><span class="select-trans" data-tab="usual" data-pos="trans_yiwen">solved.<br /></span><span class="select-trans" data-tab="usual" data-pos="trans_yiwen"><br /><span>Best regards,</span><br /><br /><span>Kenlove</span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/428692?ContentTypeID=1Thu, 01 Jun 2023 11:02:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e709165c-053a-4f86-a5ad-6b1f9600ef6frunsiv<p>Hi.&nbsp;</p> <p>If you want to include&nbsp;the app_event_manger you will need to enable it in Kconfig with the following line in prj.conf</p> <p><pre class="ui-code" data-mode="text">CONFIG_APP_EVENT_MANAGER=y</pre></p> <p>And then you add it in your main.c with an normal include as you have above(just uncomment it)</p> <p>Regards</p> <p>Runar</p><div style="clear:both;"></div>