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### Install depot_tools

Chromium and Chromium OS use a package of scripts called depot_tools to manage checkouts and code reviews.
The depot_tools package includes gclient, gclgit-clrepo, and others.

## Installing on Linux and Mac

1. Confirm git and python are installed. git 2.2.1+ recommended. python 2.7+ recommended.

2. Fetch depot_tools:
$git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git 3. Add depot_tools to your PATH: $ export PATH=pwd/depot_tools:"$PATH" • Yes, you want to put depot_tools ahead of everything else, otherwise gcl will refer to the GNU Common Lisp compiler. • You may want to add this to your .bashrc file or your shell's equivalent so that you don’t need to reset your$PATH manually each time you open a new shell.

### Preamble

Chromium is mostly designed to be run using the native Windows tools and the Msys (Git for Windows) toolchain. Cygwin is not recommended, and likely things will fail in cryptic ways.

### Instructions

• Do not use drag-n-drop or copy-n-paste extract from Explorer, this will not extract the hidden ".git" folder which is necessary for depot_tools to autoupdate itself. You can use "Extract all..." from the context menu though.
• Do not extract to a path containing spaces. If you do, gclient will produce the error "update_depot_tools.bat was not expected at this time" or similar.
2. Add depot_tools to the start (not end!) of your PATH:
• Control Panel > System and Security > System > Advanced system settings
• Modify the PATH system variable to include depot_tools
3. Run gclient from the cmd shell. The first time it is run, it will install its own copy of various tools. If you run gclient from a non-cmd shell, it may appear to run properly, but python, and other tools may not get installed correctly (while it should work fine from a msys bash shell, you may still trip over bugs from time to time).