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       /\                      \
       \_|         Arx         |
         |      Libertatis     |
         |   __________________|__

Cross-platform port of Arx Fatalis

Arx Libertatisis based on the publicly released Arx Fatalis source code. GPLv3 - read ARX_PUBLIC_LICENSE.txt



Bug Tracker:

IRC: #arxfatalis on




  • CMake 2.8+ (compile-time only, 2.8.5+ under Windows)
  • DevIL 1.7+
  • zlib
  • Boost 1.39+ (headers, program_options library)
  • Freetype
  • OpenAL 1.1+ and/or DirectSound 9

Systems without Win32 or POSIX filesystem support will also need Boost 1.44 or newer including the filesystem and system libraries.


There are rendering backends for both OpenGL and Direct3D. You need either:

  • SDL 1.2
  • OpenGL 1.5+ (OpenGL 2.1 or newer is recommended)
  • GLEW 1.5.2+


  • DirectInput 8 (included in the DirectX 9 SDK)
  • Direct3D 9

Both OpenGL and Direct3D backends can be built at the same time.

Crash Reporter

Arx Libertatis comes with an optional gui crash reporter which has additional dependencies:

  • Qt 4 (QtCore, QtGui and QtNetwork libraries)
  • GDB (Linux-only, optional, run-time only)
  • DbgHelp (Windows-only)

While the crash reporter can be run without GDB, it's main usefulness comes from generating and submitting detailed back-traces in the event of a crash. On non-window systems we use GDB, the GNU Debugger, to accomplish that. If you want to help out the arx project, please install GDB before running arx. GDB is however purely a run-time dependency and is not needed when building the crash reporter.

Compile and install

For Linux run:

$ mkdir build && cd build && cmake ..
$ make

To install the binaries system-wide, run as root:

# make install

Alternatively you can run the game by specifying the full path to the arx binary in the build directory.

The wiki has more detailed instructions on compiling under Linux.

Getting all the dependencies set up for Windows is more tricky. Pre-build dependencies are available in the ArxWindows repository and instructions on how to use them are available on the wiki.

Build options:

  • BUILD_TOOLS (default=ON): Build tools
  • BUILD_CRASHREPORTER (default=ON): Build the Qt crash reporter gui (default OFF for Mac)
  • UNITY_BUILD (default=OFF): Unity build (faster build, better optimizations but no incremental build)
  • CMAKE_BUILD_TYPE (default=Release): Set to Debug for debug binaries
  • DEBUG_EXTRA (default=OFF): Expensive debug options
  • USE_OPENAL (default=ON): Build the OpenAL audio backend
  • USE_OPENGL (default=ON): Build the OpenGL renderer backend
  • USE_SDL (default=ON): Build the SDL windowing and input backends
  • USE_NATIVE_FS (default=ON): Use the native filesystem backend (POSIX / Win32) if available and not boost::filesystem.

Windows-only options (always OFF for non-windows platforms):

  • USE_DSOUND (default=ON): Build the DirectSound audio backend
  • USE_D3D9 (default=ON): Build the Direct3D 9 renderer backend
  • USE_DINPUT8 (default=ON): Build the DirectInput 8 input backend

Install options:

  • CMAKE_INSTALL_PREFIX (default: /usr/local on UNIX and C:/Program Files on Windows): Where to install Arx Libertatis

Linux-only install options (absolute or relative to CMAKE_INSTALL_PREFIX):

  • CMAKE_INSTALL_DATAROOTDIR (default: share): Where to install data files
  • ICONDIR (default: DATAROOTDIR/pixmaps): Where to install icons
  • APPDIR (default: DATAROOTDIR/applications): Where to install .desktop files
  • CMAKE_INSTALL_MANDIR (default: DATAROOTDIR/man): Where to install man pages
  • CMAKE_INSTALL_BINDIR (default: bin): Where to install user executables
  • GAMESBINDIR (default: BINDIR): Where to install game executables
  • CMAKE_INSTALL_LIBEXECDIR (default: libexec): Where to install non-user executables

Set options by passing -D<option>=<value> to cmake.

Backends that are not available are disabled by default. The cmake run should display a summary of the enabled backends at the end.

Data file, config and savegame locations

You will need to get either the full game or demo data of Arx Fatalis.

Where arx will look for data files and write config and save files depends on the operating system and environment - the wiki has a page detailing the full data directory detection algorithm.

To print all directories considered by arx, run

$ arx --list-dirs

If you don't have a system-wide installation of the Arx Fatalis data files, you can just run arx from the directory containing the .pak files:

$ arx

Arx Libertatis will then put the config and save files in the same directory. If you have a system-wide installation, but still want to run from the current directory, use the --no-data-dir --user-dir=. --config-dir=. command-line options.

Where arx will look for a system-wide installation depends on the OS:

Under Windows, the locations for data and user (config and savegame) files can be set by the {HKCU,HKLM}\Software\ArxLibertatis\DataDir and {HKCU,HKLM}\Software\ArxLibertatis\UserDir registry keys. If not specified by a registry key, the user files are stored at %USERPROFILE%\My Documents\My Games\Arx Libertatis on XP and %USERPROFILE%\Saved Games\Arx Libertatis on Vista and up.

Under Mac OS X, the system-wide data files should be stored in /Applications/ArxLibertatis/. Config, save and per-user data files are located in ~/Library/Application Support/ArxLibertatis/.

For other systems like Linux, the data files can be in /usr/local/share/games/arx and /usr/share/games/arx as well as other locations depending on your Linux distribution. Config files are normally located in ~/.config/arx while save files are stored in ~/.local/share/arx.


Run from the directory containing the .pak files (or from anywhere in case of a system-wide installation):

$ arx

The game will try to automatically rename all used files in the user directory (but not the data directory) to lowercase on the first run if possible. System-wide installations always need to manually rename the files to lowercase - you can use the install-copy script.

You can close it with Alt + F4 or killall arx


  • arxunpak <pakfile> [<pakfile>...] - Extracts the .pak files containing the game assets.

  • arxsavetool <command> <savefile> [<options>...] - commands are:

    • extract <savefile> - Extract the contents of the given savefile to the current directly.
    • add <savefile> [<files>...] - Add files to a savefile, create it if needed.
    • fix <savefile> - Fix savegame issues created by previous builds of Arx Libertatis
    • view <savefile> <ident> - Print savegame information.


The scripts directory contains shell scripts that allow to extract/install the game data under Linux without Wine from the CD, demo, installer or any fully patched Arx Fatalis install respectively. Also see the wiki page on installing the game data under Linux.

  • scripts/install-cd path/to/cd path/to/ArxFatalis_1.21_MULTILANG.exe [output_dir]
    requires cabextract and innoextract
    ArxFatalis_1.21_MULTILANG.exe can be downloaded from the official Arx Fatalis website.

  • scripts/install-demo path/to/ [output_dir]
    requires unzip and cabextract

  • scripts/install-gog path/to/setup_arx_fatalis.exe [output_dir]
    requires innoextract
    setup_arx_fatalis.exe can be downloaded from your account after buying Arx Fatalis

  • scripts/install-copy path/to/ArxFatalis/ [output_dir]
    path/to/ArxFatalis/ should point to a fully pached (1.21) Arx Fatalis installation, such as the one from Steam

Build documentation

To build developer documentation (doxygen), run this from the build directory:

$ make doc
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