> For the complete documentation index, see [llms.txt](https://docs.novaflowos.com/start/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.novaflowos.com/start/qt6-qml-book/readme/ch03-qtcreator/kit-registry.md).

# Registering your Qt Kit

The Qt Kit is probably the most difficult aspect when it comes to working with Qt Creator initially. A Qt Kit is a set of a Qt version, compiler and device and some other settings. It is used to uniquely identify the combination of tools for your project build. A typical kit for the desktop would contain a C++ compiler and a Qt version (e.g. Qt 6.xx.yy) and a device (“Desktop”). After you have created a project you need to assign a kit to a project before Qt Creator can build the project. Before you are able to create a kit first you need to have a compiler installed and have a Qt version registered. A Qt version is registered by specifying the path to the `qmake` executable. Qt Creator then queries `qmake` for information required to identify the Qt version. This is also true for Qt 6 where CMake is the preferred build tool.

Adding a kit and registering a Qt version is done in the `Settings ‣ Build & Run` entry. There you can also see which compilers are registered.

{% hint style="info" %}
Please first check if your Qt Creator has already the correct Qt version registered and then ensure a Kit for your combination of compiler and Qt and device is specified. **You can not build a project without a kit.**
{% endhint %}