Install depot_tools:

Depot tools Windows installation instructions

Follow the instructions for installing the Chromium build deps for Visual Studio 2013

You can create a shortcut to the environment variable dialog with the path: %windir%\System32\rundll32.exe sysdm.cpl,EditEnvironmentVariables

Add the following environment variables:

• GYP_DEFINES -> component=shared_library build_with_chromium=0
• GYP_GENERATORS -> msvs
• GYP_MSVS_VERSION -> 2013
• WDK_DIR -> c:\WinDDK\7600.16385.1 (or somewhere else if you chose a custom dir)

• Clone the repository using gclient config http://webrtc.googlecode.com/svn/trunk.
• Get the source code -> gclient sync --nohooks.
• Create project files with gyp (overwriting any existing ones!) -> gclient runhooks --force.

This project is not integrated with gyp currently, so a manual setup is required.

Place this repo in the same directory as trunk/ as cloned from gclient sync.

<dir>/trunk/
<dir>/easyrtc_ie_plugin/

Open the <dir>/trunk/all.sln file in Visual Studio (VS2013). Right click root project node and "Add Existing Project..." Choose <dir>/easyrtc_ie_plugin/WebRTC_ATL.vcxproj

• Start VS2013 as Administrator (required to register ActiveX control)
• In VS2013, right click the WebRTC_ATL project node -- Select "Rebuild Project".

Once built, you can avoid rebuilding WebRTC by just choosing "Build Project".

• webrtc.org
• WebRTC Development - Getting Started