Building SourceMod

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Compiling SourceMod is not difficult, but requires a number of prerequisites. This article details the requirements and steps to being able to build working SourceMod binaries.

Note that specific compiler versions are required to maintain ABI compatibility with Source engine binaries.



  1. Install Visual Studio or Visual C++. VS/VC 2010 or above is required for SourceMod 1.6.x and earlier. VS/VC 2013 Update 2 or above is required for SourceMod 1.7.x and later (Express editions should work fine). VS/VC 2015 is required for SourceMod 1.10.x or later.
    • If you use 2013 or higher, make sure to get the "Desktop" version: Visual Studio Express 2013 for Desktop.
    • With VS/VC 2017, you may use the build tools installer to install the minimal set of packages.
      • You will want to install the following: .NET 4.6.1 SDK and corrresponding targeting pack, C++/CLI support, VC++2015.3 v14.00 toolset for desktop, Visual C++ Build Tools core features, Windows 8.1 SDK, and Windows Universal C Runtime.
      • When attempting to configure and build, use the "VS2015 x86 Native Tools Command Prompt" Start Menu option to have the build tools available in the current Command Prompt's PATH.
    • With Build Tools for Visual Studio 2019, you can install the following individual components: MSVC v140 - VS 2015 C++ build tools (v14.00), Windows Universal CRT SDK, and Windows 10 SDK.
  2. Install Git. Make sure that you select the option that adds Git to PATH.
  3. Next, you will need to start an environment capable of running Python and interacting with the Visual Studio compiler.
    • Install Python. Versions newer than 3.3 are supported; at the time of writing the latest available version is 3.11.
    • Add Python to your PATH variable. Go to Control Panel, System, Advanced, Environment Variables. Add C:\Python27;C:\Python27\Scripts to PATH (or wherever your Python install is).
    • Under Start, Programs, Microsoft Visual Studio, select the "Visual Studio Tools" folder and run "Visual Studio Command Prompt". Alternately, open a normal command prompt and run "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\vcvars.bat". Substitute your Visual Studio version if needed.


  1. Install Git, via either system packages or from the Git distribution.
  2. Install a C++ compiler and dependencies. SourceMod officially supports clang. For example, on Ubuntu/Debian:
    sudo dpkg --add-architecture i386; sudo apt update; sudo apt-get install clang lib32stdc++-7-dev lib32z1-dev libc6-dev-i386 linux-libc-dev:i386
  3. If building on a 64-bit system, you must install the 32-bit libraries for the compiler; e.g.:
    sudo apt-get install g++-multilib


  1. Enable multilib repository as described in the Archlinux wiki page.
  2. Install the following packages:
    pacman -S git python2 gcc-multilib lib32-glibc lib32-libstdc++5 lib32-zlib

Mac OS X

Mac OS X 10.7 to 10.14 is required to build, however, SourceMod will work on 10.5. SourceMod will neither build nor run on older PPC Macs. Newer versions are unsupported due to the removal of 32 bit support from MacOS.

  1. Install the Xcode Command Line Tools.
    • For OS X 10.9 or higher, run the command below in Terminal and click the Install button in the window that appears.
      xcode-select --install
    • For earlier versions of OS X, download and install Xcode from the App Store. Launch Xcode and then navigate to Preferences -> Downloads -> Components -> Command Line Tools -> Install. If you have recently upgraded Xcode, you will need to perform this step again. SourceMod cannot build without Xcode's command line tools.

Downloading Source and Dependencies

First, grab the SourceMod source tree. We recommend placing it inside its own folder, since we'll also need to download its dependencies.

You should do a recursive checkout of the git repo since the sourcepawn repo is a submodule of sourcemod now, see to do that.

mkdir -p alliedmodders
cd alliedmodders
git clone --recursive

Next, run the script. This will download all dependencies and attempt to install AMBuild. If you are using Linux or OS X, it may prompt you for your sudo password at the very end. If you want to skip this and install AMBuild manually, just Ctrl+C. (Do not run the checkout script with sudo.)

bash sourcemod/tools/

After it's done, you should see a large number of hl2sdk folders and other assorted dependencies, like MySQL, Metamod:Source, and AMBuild.

If you are on Windows, you can use 'checkout-deps' PowerShell script (if it exists), you just may need to swap ExecutionPolicy to a less restrictive one. (See:

Otherwise, you can manually download the dependencies with the commands below:

git clone --mirror hl2sdk-proxy-repo
# For each SDK you want to build with:
# git clone hl2sdk-proxy-repo hl2sdk-<SDK> -b <SDK>
# e.g. git clone hl2sdk-proxy-repo hl2sdk-csgo -b csgo

git clone mmsource-1.10 -b 1.10-dev

# If building version 1.10 of SourceMod, use MySQL 5.5
wget mysql-5.5

# If building < version 1.10 of SourceMod, use MySQL 5.0
wget mysql-5.0

# Install AMBuild
git clone
pip install ./ambuild

Note that you can skip MySQL and SDK versions you don't plan to build.


The first time you are building a SourceMod tree, you must configure the build. This step initializes some basic information and allows some customization around how things get compiled.

First create a build folder within your sourcemod folder, and then run For example:

cd sourcemod
mkdir build
cd build
python ../

Note: If it complains about Could not find a source copy of Metamod:Source, rename the mmsource-11 folder to metamod-source. See for the valid folder names it looks for

You may also need to run Python as python3 instead of python, depending on your operating system's installed Python version(s).

It is safe to reconfigure over an old build. However, it's probably a bad idea to configure inside a random, non-empty folder.

There are a few extra options you can pass to configure:

  • --enable-debug - Compile with symbols and debug checks/assertions.
  • --enable-optimize - Compile with optimizations.
  • --no-sse - Disable floating point optimizations (if you have a very, very old CPU).
  • --no-mysql - Don't build the MySQL database module.
  • --sdks css - Only build css.

See for all the options.


To build SourceMod, simply type:


In your build folder. Alternately, you can specify the path of the build folder:

ambuild debug-build

The full package layout that would be shipped for release is in the package folder of the build.

Deprecated Tools

Visual Studio Project Files

In the future, we will use AMBuild to automatically generate project files, and the existing project files will be removed from the SourceMod tree. In the meantime however, it is possible to use these files. Unfortunately, they require a bit of extra work to use.

First, make sure you've downloaded all necessary dependencies (SDKs, Metamod:Source source code, and MySQL) via the checkout-windows-deps.bat script. Next,

  1. Open the Control Panel (for example, via Start -> Settings).
  2. Open the System control. If you don't see it, you may need to switch to "Classic view" (either via the left-hand pane or by going to Tools -> Folder Options).
  3. Click the Advanced tab.
  4. Click the Environment Variables button.

Now, add your environment variables to either your User settings or your System settings. Create a new variable for each item in the list below. You may omit SDKs that you do not plan to build against. The item names are in fixed-width font and their value descriptions follow.

  • MMSOURCE19 - Path to Metamod:Source 1.10+
  • MMSOURCE18 - Path to Metamod:Source 1.10+
  • HL2SDK - Path to HL2SDK Ep1/Original
  • HL2SDKOB - Path to HL2SDK Ep2/OrangeBox for mods
  • HL2SDKOBVALVE - Path to HL2SDK Source 2009 (HL2:DM, DoD:S, TF2)
  • HL2SDK-SWARM - Path to HL2SDK Alien Swarm
  • HL2SDK-BGT - Path to HL2SDK for Bloody Good Time
  • HL2SDKCSS - Path to HL2SDK CS:S
  • HL2SDK-DARKM - Path to HL2SDK Dark Messiah
  • HL2SDK-EYE - Path to HL2SDK E.Y.E.: Divine Cybermancy
  • HL2SDKL4D - Path to HL2SDK L4D1
  • HL2SDKL4D2 - Path to HL2SDK L4D2
  • HL2SDK-DOTA - Path to HL2SDK DOTA 2
  • MYSQL5 - Path to the folder that contains MySQL's include and lib folders.


Makefiles are deprecated and will be removed from the tree soon.