.. SPDX-License-Identifier: CC-BY-SA-2.0-UK

*******************
System Requirements
*******************

Welcome to the Yocto Project Reference Manual! This manual provides
reference information for the current release of the Yocto Project, and
is most effectively used after you have an understanding of the basics
of the Yocto Project. The manual is neither meant to be read as a
starting point to the Yocto Project, nor read from start to finish.
Rather, use this manual to find variable definitions, class
descriptions, and so forth as needed during the course of using the
Yocto Project.

For introductory information on the Yocto Project, see the
:yocto_home:`Yocto Project Website <>` and the
":ref:`overview-manual/overview-manual-development-environment:the yocto project development environment`"
chapter in the Yocto Project Overview and Concepts Manual.

If you want to use the Yocto Project to quickly build an image without
having to understand concepts, work through the
:doc:`../brief-yoctoprojectqs/brief-yoctoprojectqs` document. You can find "how-to"
information in the :doc:`../dev-manual/dev-manual`. You can find Yocto Project overview
and conceptual information in the :doc:`../overview-manual/overview-manual`.

.. note::

For more information about the Yocto Project Documentation set, see
the :ref:`ref-manual/resources:links and related documentation` section.

.. _detailed-supported-distros:

Supported Linux Distributions
=============================

Currently, the &DISTRO; release ("&DISTRO_NAME;") of the Yocto Project is
supported on the following distributions:

- Ubuntu 20.04 (LTS)

- Ubuntu 22.04 (LTS)

- Fedora 38

- Debian GNU/Linux 11.x (Bullseye)

- AlmaLinux 8

The following distribution versions are still tested even though the
organizations publishing them no longer make updates publicly available:

- Ubuntu 18.04 (LTS)

Finally, here are the distribution versions which were previously
tested on former revisions of "&DISTRO_NAME;", but no longer are:

- Ubuntu 16.04 (LTS)

- Ubuntu 19.04

- Fedora 28

- Fedora 29

- Fedora 30

- Fedora 31

- Fedora 32

- Fedora 33

- Fedora 34

- Fedora 35

- Fedora 36

- Fedora 37

- CentOS 7.x

- CentOS 8.x

- Debian GNU/Linux 8.x (Jessie)

- Debian GNU/Linux 9.x (Stretch)

- Debian GNU/Linux 10.x (Buster)

- OpenSUSE Leap 15.1

- OpenSUSE Leap 15.2

- OpenSUSE Leap 15.3

.. note::

- While the Yocto Project Team attempts to ensure all Yocto Project
releases are one hundred percent compatible with each officially
supported Linux distribution, instances might exist where you
encounter a problem while using the Yocto Project on a specific
distribution.

- Yocto Project releases are tested against the stable Linux
distributions in the above list. The Yocto Project should work
on other distributions but validation is not performed against
them.

- In particular, the Yocto Project does not support and currently
has no plans to support rolling-releases or development
distributions due to their constantly changing nature. We welcome
patches and bug reports, but keep in mind that our priority is on
the supported platforms listed below.

- You may use Windows Subsystem For Linux v2 to set up a build host
using Windows 10, but validation is not performed against build
hosts using WSLv2.

- The Yocto Project is not compatible with WSLv1, it is
compatible but not officially supported nor validated with
WSLv2, if you still decide to use WSL please upgrade to WSLv2.

- If you encounter problems, please go to :yocto_bugs:`Yocto Project
Bugzilla <>` and submit a bug. We are
interested in hearing about your experience. For information on
how to submit a bug, see the Yocto Project
:yocto_wiki:`Bugzilla wiki page </wiki/Bugzilla_Configuration_and_Bug_Tracking>`
and the ":ref:`dev-manual/dev-manual-common-tasks:submitting a defect against the yocto project`"
section in the Yocto Project Development Tasks Manual.

Required Packages for the Build Host
====================================

The list of packages you need on the host development system can be
large when covering all build scenarios using the Yocto Project. This
section describes required packages according to Linux distribution and
function.

.. _ubuntu-packages:

Ubuntu and Debian
-----------------

The following list shows the required packages by function given a
supported Ubuntu or Debian Linux distribution:

.. note::

- If your build system has the ``oss4-dev`` package installed, you
might experience QEMU build failures due to the package installing
its own custom ``/usr/include/linux/soundcard.h`` on the Debian
system. If you run into this situation, either of the following
solutions exist:
::

$ sudo apt-get build-dep qemu
$ sudo apt-get remove oss4-dev

- For Debian-8, ``python3-git`` and ``pylint3`` are no longer
available via ``apt-get``.
::

$ sudo pip3 install GitPython pylint==1.9.5

- *Essentials:* Packages needed to build an image on a headless system:
::

$ sudo apt-get install &UBUNTU_HOST_PACKAGES_ESSENTIAL;

- *Documentation:* Packages needed if you are going to build out the
Yocto Project documentation manuals:
::

$ sudo apt-get install make python3-pip
&PIP3_HOST_PACKAGES_DOC;

.. note::

It is currently not possible to build out documentation from Debian 8
(Jessie) because of outdated ``pip3`` and ``python3``. ``python3-sphinx``
is too outdated.

Fedora Packages
---------------

The following list shows the required packages by function given a
supported Fedora Linux distribution:

- *Essentials:* Packages needed to build an image for a headless
system:
::

$ sudo dnf install &FEDORA_HOST_PACKAGES_ESSENTIAL;

- *Documentation:* Packages needed if you are going to build out the
Yocto Project documentation manuals:
::

$ sudo dnf install make python3-pip which
&PIP3_HOST_PACKAGES_DOC;

openSUSE Packages
-----------------

The following list shows the required packages by function given a
supported openSUSE Linux distribution:

- *Essentials:* Packages needed to build an image for a headless
system:
::

$ sudo zypper install &OPENSUSE_HOST_PACKAGES_ESSENTIAL;

- *Documentation:* Packages needed if you are going to build out the
Yocto Project documentation manuals:
::

$ sudo zypper install make python3-pip which
&PIP3_HOST_PACKAGES_DOC;

CentOS-7 Packages
-----------------

The following list shows the required packages by function given a
supported CentOS-7 Linux distribution:

- *Essentials:* Packages needed to build an image for a headless
system:
::

$ sudo yum install &CENTOS7_HOST_PACKAGES_ESSENTIAL;

.. note::

- Extra Packages for Enterprise Linux (i.e. ``epel-release``) is
a collection of packages from Fedora built on RHEL/CentOS for
easy installation of packages not included in enterprise Linux
by default. You need to install these packages separately.

- The ``makecache`` command consumes additional Metadata from
``epel-release``.

- *Documentation:* Packages needed if you are going to build out the
Yocto Project documentation manuals:
::

$ sudo yum install make python3-pip which
&PIP3_HOST_PACKAGES_DOC;

CentOS-8 Packages
-----------------

The following list shows the required packages by function given a
supported CentOS-8 Linux distribution:

- *Essentials:* Packages needed to build an image for a headless
system:
::

$ sudo dnf install &CENTOS8_HOST_PACKAGES_ESSENTIAL;

.. note::

- The ``PowerTools`` repo provides additional packages such as
``rpcgen`` and ``texinfo``.

- The ``makecache`` command consumes additional Metadata from
``epel-release``.

- *Documentation:* Packages needed if you are going to build out the
Yocto Project documentation manuals:
::

$ sudo dnf install make python3-pip which
&PIP3_HOST_PACKAGES_DOC;

Required Git, tar, Python and gcc Versions
==========================================

In order to use the build system, your host development system must meet
the following version requirements for Git, tar, and Python:

- Git 1.8.3.1 or greater

- tar 1.28 or greater

- Python 3.5.0 or greater

If your host development system does not meet all these requirements,
you can resolve this by installing a ``buildtools`` tarball that
contains these tools. You can get the tarball one of two ways: download
a pre-built tarball or use BitBake to build the tarball.

In addition, your host development system must meet the following
version requirement for gcc:

- gcc 5.0 or greater

If your host development system does not meet this requirement, you can
resolve this by installing a ``buildtools-extended`` tarball that
contains additional tools, the equivalent of ``buildtools-essential``.

Installing a Pre-Built ``buildtools`` Tarball with ``install-buildtools`` script
--------------------------------------------------------------------------------

The ``install-buildtools`` script is the easiest of the three methods by
which you can get these tools. It downloads a pre-built buildtools
installer and automatically installs the tools for you:

1. Execute the ``install-buildtools`` script. Here is an example:
::

$ cd poky
$ scripts/install-buildtools --without-extended-buildtools \
--base-url &YOCTO_DL_URL;/releases/yocto \
--release yocto-&DISTRO; \
--installer-version &DISTRO;

During execution, the buildtools tarball will be downloaded, the
checksum of the download will be verified, the installer will be run
for you, and some basic checks will be run to to make sure the
installation is functional.

To avoid the need of ``sudo`` privileges, the ``install-buildtools``
script will by default tell the installer to install in:
::

/path/to/poky/buildtools

If your host development system needs the additional tools provided
in the ``buildtools-extended`` tarball, you can instead execute the
``install-buildtools`` script with the default parameters:
::

$ cd poky
$ scripts/install-buildtools

2. Source the tools environment setup script by using a command like the
following:
::

$ source /path/to/poky/buildtools/environment-setup-x86_64-pokysdk-linux

Of course, you need to supply your installation directory and be sure to
use the right file (i.e. i586 or x86_64).

After you have sourced the setup script, the tools are added to
``PATH`` and any other environment variables required to run the
tools are initialized. The results are working versions versions of
Git, tar, Python and ``chrpath``. And in the case of the
``buildtools-extended`` tarball, additional working versions of tools
including ``gcc``, ``make`` and the other tools included in
``packagegroup-core-buildessential``.

Downloading a Pre-Built ``buildtools`` Tarball
----------------------------------------------

Downloading and running a pre-built buildtools installer is the easiest
of the two methods by which you can get these tools:

1. Locate and download the ``*.sh`` at :yocto_dl:`/releases/yocto/&DISTRO_REL_TAG;/buildtools/`

2. Execute the installation script. Here is an example for the
traditional installer:
::

$ sh ~/Downloads/x86_64-buildtools-nativesdk-standalone-DISTRO.sh

Here is an example for the extended installer:
::

$ sh ~/Downloads/x86_64-buildtools-extended-nativesdk-standalone-DISTRO.sh

During execution, a prompt appears that allows you to choose the
installation directory. For example, you could choose the following:
``/home/your-username/buildtools``

3. Source the tools environment setup script by using a command like the
following:
::

$ source /home/your_username/buildtools/environment-setup-i586-poky-linux

Of
course, you need to supply your installation directory and be sure to
use the right file (i.e. i585 or x86-64).

Building Your Own ``buildtools`` Tarball
----------------------------------------

Building and running your own buildtools installer applies only when you
have a build host that can already run BitBake. In this case, you use
that machine to build the ``.sh`` file and then take steps to transfer
and run it on a machine that does not meet the minimal Git, tar, and
Python (or gcc) requirements.

Here are the steps to take to build and run your own buildtools
installer:

1. On the machine that is able to run BitBake, be sure you have set up
your build environment with the setup script
(:ref:`structure-core-script`).

2. Run the BitBake command to build the tarball:
::

$ bitbake buildtools-tarball

or run the BitBake command to build the extended tarball:
::

$ bitbake buildtools-extended-tarball

.. note::

The :term:`SDKMACHINE` variable in your ``local.conf`` file determines
whether you build tools for a 32-bit or 64-bit system.

Once the build completes, you can find the ``.sh`` file that installs
the tools in the ``tmp/deploy/sdk`` subdirectory of the
:term:`Build Directory`. The installer file has the string
"buildtools" (or "buildtools-extended") in the name.

3. Transfer the ``.sh`` file from the build host to the machine that
does not meet the Git, tar, or Python (or gcc) requirements.

4. On the machine that does not meet the requirements, run the ``.sh``
file to install the tools. Here is an example for the traditional
installer:
::

$ sh ~/Downloads/x86_64-buildtools-nativesdk-standalone-&DISTRO;.sh

Here is an example for the extended installer:
::

$ sh ~/Downloads/x86_64-buildtools-extended-nativesdk-standalone-&DISTRO;.sh

During execution, a prompt appears that allows you to choose the
installation directory. For example, you could choose the following:
``/home/your_username/buildtools``

5. Source the tools environment setup script by using a command like the
following:
::

$ source /home/your_username/buildtools/environment-setup-x86_64-poky-linux

Of course, you need to supply your installation directory and be sure to
use the right file (i.e. i586 or x86_64).