This page provides an overview of the Native Client SDK, and instructions fordownloading and installing the SDK.

Overview

The Native Client SDK includes:

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Support for multiple Pepper versions to compile for specific minimumversions of Chrome.
Update utility to download new bundles and updates to existing bundles.
Toolchains to compile for Portable Native Client (PNaCl), traditionalNative Client (NaCl), and for compiling architecture-specific Native Clientapplications with glibc.
Examples Including C or C++ source files and header files illustratinghow to use NaCl and Pepper, and Makefiles to build the example with each ofthe toolchains.
Tools for validating Native Client modules and running modules from thecommand line.

Follow the steps below to download and install the Native Client SDK.

Prerequisites

Python 2.7

Make sure that the Python executable is in your PATH variable. Python 3.x isnot yet supported.

On Mac and Linux, Python is likely preinstalled. Run the command python -Vin a terminal window, and make sure that the version you have is 2.7.x.
On Windows, you may need to install Python. Go to https://www.python.org/download/ and select the latest 2.xversion. In addition, be sure to add the Python directory (for example,C:python27) to the PATHenvironment variable. Run python -V from a command line toverify that you properly configured the PATH variable.

Make

On the Mac, you need to install make on your system before you can buildand run the examples in the SDK. One easy way to get make, along withseveral other useful tools, is to install Xcode Developer Tools. After installing Xcode,go to the XCode menu, open the Preferences dialog box then select Downloadsand Components. Verify that Command Line Tools are installed.
On Windows, the Native Client SDK includes a copy of GNU Make.

Platforms

Native Client supports several operating systems, including Windows, Linux, OSX,and ChromeOS. It supports several architectures including on x86-32, x86-64,ARM, and MIPS.

Versions

Chrome is released on a six week cycle, and developer versions of Chrome arepushed to the public beta channel three weeks before each release. As with anysoftware, each release of Chrome may include changes to Native Client and thePepper interfaces that may require modification to existing applications.However, modules compiled for one version of Pepper/Chrome should work withsubsequent versions of Pepper/Chrome. The SDK includes multiple versions of thePepper APIs to help developers make adjustments to API changes and takeadvantage of new features: stable, beta and dev.

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Installing the SDK

Downloading and Unzipping

Download the SDK update zip file.
Unzip the file:
- On Mac/Linux, run the command unzip nacl_sdk.zip in a terminalwindow.
- On Windows, right-click on the .zip file and select “Extract All..”. Adialog box opens; enter a location and click “Extract”.
A directory is created called nacl_sdk with the following files anddirectories:
- naclsdk (and naclsdk.bat for Windows) — the update utility,which is the command you run to download and update bundles.
- sdk_cache — a directory with a manifest file that lists the bundlesyou have already downloaded.
- sdk_tools — the code run by the naclsdk command.

Installing the stable bundle

To see the SDK bundles that are available for download, go to thenacl_sdk directory and run naclsdk with the list command. The SDKincludes a separate bundle for each version of Chrome/Pepper.
On Mac/Linux:
On Windows:
You should see output similar to this:
The sample output above shows that several bundles are available fordownload, and that you have already installed the latest revision of thesdk_tools bundle, which was included in the zip file. You never need toupdate the sdk_tools bundle. It is updated automatically (if necessary)whenever you run naclsdk.
Bundles are labeled post-stable, stable, beta, dev, or canary. These labelsusually correspond to the current versions of Chrome. We recommend that youdevelop against a “stable” bundle, because such bundles can be used by allcurrent Chrome users. Native Client is designed to be backward-compatible.Forexample, applications developed with the pepper_37 bundle can run inChrome 37, Chrome 38, etc.
Run naclsdk with the update command to download recommended bundles,including the current “stable” bundle.
On Mac/Linux: Seashore download mac. Mac os el capitan direct download link.
On Windows:
By default, naclsdk only downloads bundles that are recommended,generally those that are “stable.” For example, if the current “stable”bundle is pepper_35, then the update downloads that bundle. Todownload the pepper_36 bundle you must ask for it explicitly:

Updating bundles

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Run naclsdk with the list command. This shows you the list of availablebundles and verifies which bundles you have installed.
On Mac/Linux:
On Windows:
An asterisk (*) next to a bundle indicates that there is an update availableit. For example:
If you run naclsdk update now, it warns you with a message similar tothis:
To download and install the new bundle, run:
On Mac/Linux:
On Windows:

Help with the `naclsdk` utility

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For more information about the naclsdk utility, run:
On Mac/Linux:
On Windows:

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Next steps

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Browse the Release Notes for importantinformation about the SDK and new bundles.
If you’re just starting with Native Client, we recommend reading theTechnical Overview and walking through theGetting Started Tutorial.
If you’d rather dive in, seeBuilding Native Client Modules.