How to Set Up OpenClaw: A Complete Beginner's Guide (2026)

What is OpenClaw?

OpenClaw is a community-developed engine that recreates the gameplay of Claw (1997), the side-scrolling platformer by Monolith Productions. The project is written in C++ and uses SDL2, making it cross-platform — it runs on Windows, Linux, and macOS.

Important: OpenClaw is not a standalone game. It is an engine. You still need the original game's asset files (levels, sounds, sprites) to play. OpenClaw simply replaces the original executable with a modern, open-source alternative.

How Does OpenClaw Work?

OpenClaw reads the original .wwd level files, .wav audio files, and image resources that shipped with the retail Claw game. It interprets those assets using its own rendering and physics engine built on top of SDL2 and Box2D.

The pipeline looks like this:

You provide the original game assets (from a purchased copy or GOG release).
OpenClaw loads those assets at runtime.
The SDL2 renderer draws the game window; Box2D handles collision and physics.
Input, audio, and save states are managed by the OpenClaw engine itself.

This means bug fixes, resolution scaling, and quality-of-life improvements can be added without touching the original assets.

Prerequisites

Before you start, make sure you have:

Original Claw game files — the GOG.com version works well.
Git — to clone the source repository.
CMake (3.2 or newer) — for building the project.
A C++ compiler — GCC, Clang, or MSVC.
SDL2 development libraries — SDL2, SDL2_image, SDL2_mixer, SDL2_ttf.
Box2D — physics library (often bundled or fetched by CMake).

Step-by-Step Setup

Step 1: Clone the Repository

Clone the OpenClaw repository from GitHub and enter the project directory:

git clone https://github.com/pjako/OpenClaw.git
cd OpenClaw

Check the repository's README for the current default branch name, as it may differ from main.

Step 2: Install Dependencies

On Ubuntu/Debian:

sudo apt-get update
sudo apt-get install cmake build-essential \
  libsdl2-dev libsdl2-image-dev \
  libsdl2-mixer-dev libsdl2-ttf-dev \
  libbox2d-dev

On Windows (vcpkg recommended):

vcpkg install sdl2 sdl2-image sdl2-mixer sdl2-ttf box2d

Then pass the vcpkg toolchain file to CMake in the next step.

On macOS (Homebrew):

brew install cmake sdl2 sdl2_image sdl2_mixer sdl2_ttf box2d

Step 3: Build with CMake

mkdir build
cd build
cmake ..
cmake --build . --config Release

On Windows with vcpkg, replace the first cmake line with:

cmake .. -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake

After a successful build, you will find the openclaw (or openclaw.exe) binary inside the build directory.

Step 4: Locate Your Game Assets

You need the original Claw data files. If you own the GOG version:

Install the game through GOG Galaxy or the offline installer.
Navigate to the installation folder (e.g., C:\GOG Games\Claw).
You are looking for the CLAW.REZ file and the STATES folder.

Step 5: Configure Asset Paths

OpenClaw expects a config.xml (or similar config file — check the repo's docs/ folder for the exact filename) that points to your asset directory.

A minimal example:

<Config>
    <AssetsFolder>C:/GOG Games/Claw/</AssetsFolder>
    <AudioEnabled>1</AudioEnabled>
    <MusicEnabled>1</MusicEnabled>
</Config>

Place this file in the same directory as the OpenClaw executable.

Step 6: Run OpenClaw

Navigate to your build output directory and launch the binary:

./openclaw          # Linux/macOS
openclaw.exe        # Windows

If assets are found and the config is correct, the game should launch directly into the main menu.

Key Features

🖥️ Modern Resolution Support

Play at resolutions the original 1997 engine never supported, without patching the original assets.

🌐 Cross-Platform

Windows, Linux, and macOS from a single C++ codebase built on SDL2.

🔓 Open Source

The community can patch bugs present in the 1997 release and contribute new quality-of-life improvements.

⚖️ No Copyright Issues

You supply your own legally purchased game files — OpenClaw never distributes copyrighted assets.

🔧 Active Physics Rewrite

Box2D provides more predictable collision behavior than the original engine's physics implementation.

🎮 Community-Maintained

Active contributions in 2026 mean the project continues to improve with dependency updates and bug fixes.

Common Issues and Fixes

Problem	Likely Cause	Fix
"Assets not found" on launch	Wrong path in config	Use absolute paths; check for trailing slash
Black screen / no audio	Missing SDL2_mixer	Reinstall SDL2_mixer dev package
Crash on level load	Mismatched asset version	Ensure you are using the GOG 1.02 version
Build fails on Windows	vcpkg not linked	Pass `-DCMAKE_TOOLCHAIN_FILE` to CMake

Use Cases

Nostalgia gaming — replay a late-90s classic on a modern OS without compatibility layers like Wine or DOSBox.
Game engine study — the codebase is a readable, real-world example of a 2D platformer engine written in C++.
Modding — community members have used OpenClaw as a base for custom level experiments and gameplay tweaks.
Porting — developers have used it as a reference when porting SDL2-based games to new platforms.

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Frequently Asked Questions

Q: Do I need to own the original Claw game to use OpenClaw?

A: Yes. OpenClaw is an engine, not a standalone game. You must supply the original game's asset files yourself. The GOG.com release of Claw (1997) is the most reliable source and is confirmed compatible with version 1.02.

Q: Does OpenClaw work on Windows 11?

A: Yes. OpenClaw is cross-platform and builds cleanly on Windows 10 and 11 using MSVC or MinGW with the vcpkg dependency manager. Follow the Windows-specific CMake toolchain instructions in Step 3.

Q: What version of the Claw assets should I use?

A: The GOG 1.02 version is recommended. Using a different version or a pirated copy may cause crashes on level load due to mismatched asset formats.

Q: Why does my build fail on Windows even after installing vcpkg?

A: You must explicitly pass the vcpkg toolchain file to CMake using the -DCMAKE_TOOLCHAIN_FILE flag. CMake does not automatically detect vcpkg. See Step 3 for the exact command.

Q: Can I mod OpenClaw or create custom levels?

A: Yes. Because OpenClaw reads standard .wwd level files, community members have used it as a base for custom level experiments. The open-source codebase also allows direct engine modifications.

Q: Is OpenClaw still actively maintained in 2026?

A: The project continues to receive community contributions. Always check the official GitHub repository README for the latest dependency version requirements and branch information before building.

Final Thoughts

Setting up OpenClaw takes about 15–30 minutes if your build environment is already configured. The core steps are: clone the repo, install SDL2 and Box2D dependencies, build with CMake, point the config at your original Claw assets, and run the binary.

The project is well-suited for anyone who wants to revisit a classic late-90s platformer on modern hardware, study a real-world SDL2/Box2D engine implementation, or explore the foundations of 2D game engine architecture in C++.

Always check the official repository README for dependency version updates, as the project continues to receive community contributions in 2026.

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