PX4 toolchain
The PX4 project provides a set of recommended tools that you can use to develop, build and debug PX4 and other Dronecode software projects.
To start building PX4 firmware from source, you should first install the PX4 toolchain. This provides you with all the tools required to develop, build and debug PX4 Autopilot, but the same tools are also often used for other software projects. You could directly install the toolchain on your main operating system, but we recommend to install it inside the virtual machine we created as described on the previous pages.

The minimal installation that we selected does not include Git by default. Git is a very popular distributed version-control system and you will probably use it a lot when developing software for the HoverGames. It will also allow us to easily download ("clone") the PX4 code because it is available on GitHub, which is a Git-based source code hosting platform.
So let's install Git using the following command:
sudo apt install git

Before we install any tools we will download the PX4 source code. The PX4 developers have included a script that makes it much easier to install all required tools. Let's first create a folder to hold all sourcecode that we are going to work with. The following command creates the "src" folder in the user's home folder (if it doesn't exist already):
mkdir -p ~/src
The next step is to actually download the source code. We will use Git to create a local copy of the online repository that is hosted on GitHub. The following command first changes the working directory to the "src" folder that we just created, then it will "clone" the whole PX4 firmware repository, including submodules, in a new "px4-firmware" folder.
cd ~/src && git clone --recursive https://github.com/PX4/Firmware.git px4-firmware
Note that it will take a while to clone the whole repository. The PX4 source code should now be available in the ~/src/px4-firmware folder. The tilde represents the current user's home folder within the file system. You can also browse to this location with the file manager.

As already mentioned, the PX4 developers provide a bash script to easily install all the tools that you need to build the PX4 firmware. We already cloned the PX4 source code, so we can just change our working directory and run the script:
cd ~/src/px4-firmware && bash ./Tools/setup/ubuntu.sh
You should reboot the virtual machine after the installation is done.

Make sure to reboot your computer after the toolchain installation is finished. Then change your working directory to the PX4 firmware repository again and start a build for the FMUK66 using the following command:
cd ~/src/px4-firmware && make nxp_fmuk66-v3_default
After the build process has finished, you should be able to find .bin, .px4 and .elf files in the ~/src/px4-firmware/build/nxp_fmuk66-v3_default folder. We will later come back to building your own firmware binaries, when we set up an IDE (integrated development environment) to do it for us.

You should also install the latest daily build of QGroundControl inside your VM. You probably already have the (recommended!) stable version of QGroundControl installed on your host operating system, but you might need the latest development version if you want to play with new (experimental) features of PX4.
Luckily, it is much easier and quicker to switch between different AppImages in Linux than it is to reinstall another version of QGroundControl in Windows. You don't have to install an AppImage. You only have to make the file executable and then you can run the program immediately.
Links to the latest daily build are provided in the QGroundControl user guide. You need the Linux version.
Daily Builds · QGroundControl User Guide
Save the QGroundControl.AppImage file to an easily accessible location such as the homefolder or desktop. Then, right click on the file, go to the file properties, and give the file permission to execute as a program.
You don't have to update QGroundControl every day. However, you should download a new AppImage regularly (once a month) or whenever you run into some issue with QGroundControl. If the issue still exists in the latest daily build then you can open an issue on GitHub.
Alternatively, you can make the file executable by running the following command, assuming the AppImage file is located in your home folder:
chmod +x ~/QGroundControl.AppImage
More information about using an AppImage is available in the QGroundControl User Guide:
Download and Install · QGroundControl User Guide
You can now continue to the next page. We will set up the NXP MCUXpresso integrated development environment (IDE) to edit, build and debug the PX4 firmware.
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On this page
Install Git
Download the PX4 source code
Install the toolchain
Make your first PX4 build
QGroundControl daily build