https://devzone.nordicsemi.com/f/nordic-q-a/89104/header-files-not-addingHi there, I can&#39;t seem to add header files to my project. The header files underlined in red are not from the Nordic SDK installed from the Toolchain Manager. I have the header files added in an inc folder and the path in the c_cpp_propertiesen-USTelligent Community 13Mon, 20 Jun 2022 12:30:39 GMThttps://devzone.nordicsemi.com/thread/373233?ContentTypeID=1Mon, 20 Jun 2022 12:30:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2030454-b0a3-412c-9c8b-9955ea3d8b38Einarh<p>Hello!</p> <p>What exactly are you trying to add to your project?</p> <p>It looks like you might be trying to add libraries from a different SDK, maybe to port a project you had in an old SDK over to NCS?</p> <p>If that is the case, I would advise you to not use those old libraries and instead use the libraries that are available to you in Zephyr, such as&nbsp;<a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/hardware/peripherals/uart.html">UART</a>,&nbsp;<a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/scheduling/index.html">scheduling</a>, etc.</p> <p>Though if you still want to include your own header files, then I haven&#39;t seen json files like these used in Zephyr.</p> <p>Have a look at the typical Zephyr project structure illustrated <a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/build/zephyr_cmake_package.html#zephyr-freestanding-application">here</a>.</p> <p>You could try to point cmake towards your source code using the target_sources build script in CMakeLists.txt as described <a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/build/cmake/index.html#build-system-cmake">here</a>.</p> <p>But only if you&#39;re trying to include your own header files, please do not try to include header files from old SDKs outside NCS.</p> <p>Best regards,</p> <p>Einar</p><div style="clear:both;"></div>