# Hello World tutorial

The purpose of this tutorial is to explain how to build a Qt app depending on the Linphone SDK and to create the `Core` object that all our APIs depends on.

The user interface will only display the `Core`'s version, but in the next tutorial you will learn how to use it to login your SIP account.


## How to build

In the following instructions, replace **<PATH-TO-SDK>** by the real path where your SDK is located, e.g. *~/projects/linphone-sdk/build-default/linphone-sdk/desktop/*

    mkdir build
    cd build
    cmake .. -DCMAKE_PREFIX_PATH=<PATH-TO-SDK>
    cmake --build .