# 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 %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.novaflowos.com/start/qt6-qml-book/readme/ch03-qtcreator/kit-registry.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.