Development Setup

This page is intended as a guide for those who wish to build the HEAD of sway and wlroots for testing or development purposes. This page isn't relevant to end-users.

Dependencies

You're going to need the following tools to get started:

• git
• gcc or clang
• meson
• ninja

You'll also need the dependencies, which you can find in the README. If you don't have recent enough versions of some of the dependencies, you can build them as subprojects (see below).

Arch Linux

The Arch User Repository (AUR) has the convenient sway-git and wlroots-git packages, which contain everything you'll need to compile their respective projects. Use your preferred AUR helper to install these.

Fedora

Fedora requires installing all of the dependencies one-by-one. --releasever=29 is required as dependencies for versions below 29 are outdated.

Note: wayland-protocols-devel is currently outdated for release 29. You will need to pull and install this for yourself from https://github.com/wayland-project/wayland-protocols.

dnf install -y --releasever=29 git gcc meson ninja-build wayland-devel mesa-libEGL-devel mesa-libGLES-devel mesa-dri-drivers xorg-x11-server-Xwayland libdrm-devel libgbm-devel libxkbcommon-devel libudev-devel pixman-devel libinput-devel libevdev-devel systemd-devel cairo-devel libpcap-devel json-c-devel pam-devel pango-devel pcre-devel gdk-pixbuf2-devel

Debian

On Debian-based distributions, library packages are commonly suffixed by -dev.

Compiling as a subproject

You can build and run sway directly without installing it. A subproject allows to easily work on wlroots and sway at the same time.

# Clone repositories
git clone git@github.com:swaywm/sway.git
cd sway
git clone git@github.com:swaywm/wlroots.git subprojects/wlroots

# Build sway and wlroots
meson build/
ninja -C build/

# Start sway
build/sway/sway

To enable the address sanitizer (ASan) and the undefined behavior sanitizer (UBSan), add -Db_sanitize=address,undefined to the meson command.

In order to be able to collect core dumps on ASan failures (to inspect variable state at the point of failure, for instance), you must specify ASAN_OPTIONS=abort_on_error=1:disable_coredump=0:unmap_shadow_on_exit=1 in the environment that you launch sway in.

When pulling from the Sway repo, remember to also pull from the wlroots repo.

If you don't have a recent enough version of libseat or wayland-protocols, you can use subprojects like so:

git clone https://gitlab.freedesktop.org/wayland/wayland-protocols.git subprojects/wayland-protocols
git clone https://git.sr.ht/~kennylevinsen/seatd subprojects/seatd

If you don't have Sway installed on your system or if you want to test swaybar/swaymsg/swaynag changes, you can populate your PATH like so:

export PATH=build/swaybar:build/swaymsg:build/swaynag:$PATH

Alternatively, you can also add swaybar_command/swaynag_command/swaybar_command to your config with custom executable paths.

System-wide installation

This section is relevant if you want to install both wlroots and sway system-wide (not using a subproject).

Variables

If you don't want to add the paths below to your ~/.profile, you can paste these lines into your terminal to set the variables for the current terminal session only.

Ensure that /usr/local/bin is in your PATH by executing echo $PATH. If it isn't, open ~/.profile and add:

export PATH=/usr/local/bin:$PATH

Ensure that your PKG_CONFIG_PATH contains /usr/local/lib/pkgconfig, /usr/local/lib64/pkgconfig, and /usr/local/share/pkgconfig by executing echo $PKG_CONFIG_PATH. If it doesn't, open ~/.profile and add:

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
export PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig:$PKG_CONFIG_PATH
export PKG_CONFIG_PATH=/usr/local/share/pkgconfig:$PKG_CONFIG_PATH

Ensure that your LD_LIBRARY_PATH contains /usr/local/lib/ and /usr/local/lib64/ by executing echo $LD_LIBRARY_PATH. If it doesn't, open the ~/.profile file located in your home directory and add:

export LD_LIBRARY_PATH=/usr/local/lib/:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=/usr/local/lib64/:$LD_LIBRARY_PATH

Execute source ~/.profile to update the variables for your current terminal session. You should ensure that your chosen shell sources ~/.profile on login (you may need to delete ~/.bash_profile for it to take precedent).

Compiling

You're now ready to compile wlroots, which is the Wayland compositor library used by sway.

• Clone the wlroots repository with git
• Execute meson build, which will create the build directory
• Execute ninja -C build to build
• Execute sudo ninja -C build install to install
• Verify that either /usr/local/lib or /usr/local/lib64 contain libwlroots.so

Now that wlroots is built and installed, you can build sway.

• Clone the sway repository with git
• Execute meson build, which will create the build directory
• Execute ninja -C build to build
• Execute sudo ninja -C build install to install
• Verify that /usr/local/bin contains the sway, swaybar, swaylock, etc. binaries

Since sway and wlroots development moves fast, it's common to have issues compiling sway if your installed version of wlroots is behind. As a first step of compile error troubleshooting, pull, build, and reinstall wlroots.