Depot Tools

1. You'll need to have the depot tools installed:

2. You need git installed (needed for getting WebM source):

Linux (Ubuntu/Debian)

This, and more, is described on the Chromium site:

A script is provided for Ubuntu, which is available after your first gclient sync:
$ ./build/install-build-deps.sh

Pulse Audio is missing from the script. On Ubuntu, this is provided by the libpulse-dev package.

Although the install-build-deps.sh script is the recommended method, it will install much more than you need. Here is a (hopefully complete) minimal list of packages to install (sudo apt-get install...):

  g++ (>= 4.2)
  python (>= 2.4)
  libnss3-dev >= 3.12
  libasound2-dev
  libpulse-dev
  libjpeg62-dev
  libxv-dev
  libgtk2.0-dev
  libexpat1-dev

For 32-bit builds on a 64-bit system:
  lib32asound2-dev
  ia32-libs

Tips for other distributions are available on the Chromium page.

Windows

Follow step 1 in Chromium's build instructions: http://www.chromium.org/developers/how-tos/build-instructions-windows

OS X

 XCode 3.0 or higher

Android

These instructions are tested on a Linux development machine.
In WebRTC, we're using the same Android toolchain as Chrome (the one that is downloaded into third_party/android_tools if you follow AndroidBuildInstructions). So you don't need to install NDK/SDK separately.