The WebKit Open Source Project

Building WebKit

Building WebKit requires that you have the proper developer tools installed and that you have a copy of the WebKit source tree.


  1. Open a Cygwin Shell (if not already open from checking out sources)

    Double-click the Cygwin icon on your Desktop to launch a new shell.

  1. Run the build-webkit script to build WebKit.

    Use the --debug option for a debug build, which includes debugging symbols and assertions:

    build-webkit --debug

By default, build-webkit places build products in WebKitBuild. You can specify a different build location on Mac in your Xcode preferences. On other platforms, the WEBKIT_OUTPUTDIR environment variable can be used to set a different build products location. If you have set up a custom build location, then build-webkit will place the build products there.


Building on Windows requires a few more steps, you should look at:

Don't forget that if you have any questions or problems building WebKit, feel free to get in touch!

Once your build has finished, you can run it inside Safari.

Building WebKit from Xcode

To build from within Xcode, you can use the WebKit workspace. Ensure that the Products and Intermediates locations for the workspace match those used by build-webkit by choosing File > Workspace Settings and clicking the Advanced button, selecting Custom, Relative to Workspace, and entering WebKitBuild both for Products and for Intermediates. Note that if you have specified a custom build location in Xcode preferences, then you don’t need to do this.

Setting a Default Configuration

  1. To set a default build configuration for build-webkit and other scripts, use the set-webkit-configuration script:

    set-webkit-configuration --debug

    set-webkit-configuration --release