page.title=Requirements
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    <h2>In this document</h2>
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<p>Before you download and build the Android source, ensure your system meets
  the following requirements. Then see <a href="initializing.html">Establishing a
  Build Environment</a> for installation instructions by operating system.</p>

<h2 id=hardware-requirements>Hardware requirements</h2>

<p>Your development workstation should meet or exceed these hardware requirements:</p>

<ul>

  <li>A 64-bit environment is required for Gingerbread (2.3.x) and newer
  versions, including the master
  branch. You can compile older versions on 32-bit systems.
  </li>

  <li>At least 100GB of free disk space for a checkout, 150GB for a single
  build, and 200GB or more for multiple builds. If you employ ccache, you will
  need even more space.</p>
  </li>

  <li>If you are running Linux in a virtual machine, you need at
  least 16GB of RAM/swap.
  </li>

</ul>

<h2 id=software-requirements>Software requirements</h2>

<p>The <a
  href="https://android.googlesource.com/">Android Open Source Project
  (AOSP)</a> <code>master</code> branch is traditionally developed and tested
  on Ubuntu Long Term Support (LTS) releases, but other distributions may be
  used. See the list below for recommended versions.</p>

<p>You workstation must have the software listed below. See <a
  href="initializing.html">Establishing a Build Environment</a> for
  additional required packages and the commands to install them.</p>

<h3 id=operating-system>Operating system</h3>

<p>Android is typically built with a GNU/Linux or Mac OS operating system. It is
  also possible to build Android in a virtual machine on unsupported systems such
  as Windows.</br>

<h4 id=linux>GNU/Linux</h4>

  <ul>
    <li>Android 6.0 (Marshmallow) - AOSP master: Ubuntu 14.04 (Trusty)</li>
    <li>Android 2.3.x (Gingerbread) - Android 5.x (Lollipop): Ubuntu 12.04 (Precise)</li>
    <li>Android 1.5 (Cupcake) - Android 2.2.x (Froyo): Ubuntu 10.04 (Lucid)</li>
  </ul>

<h4 id=mac>Mac OS (Intel/x86)</h4>

  <ul>
    <li>Android 6.0 (Marshmallow) - AOSP master: Mac OS v10.10 (Yosemite) or
    later with Xcode 4.5.2 and Command Line Tools</li>
    <li>Android 5.x (Lollipop): Mac OS v10.8 (Mountain Lion) with Xcode 4.5.2
    and Command Line Tools</li>
    <li>Android 4.1.x-4.3.x (Jelly Bean) - Android 4.4.x (KitKat): Mac OS v10.6
    (Snow Leopard) or Mac OS X v10.7 (Lion) and Xcode 4.2 (Apple's Developer
    Tools)</li>
    <li>Android 1.5 (Cupcake) - Android 4.0.x (Ice Cream Sandwich): Mac OS
    v10.5 (Leopard) or Mac OS X v10.6 (Snow Leopard) and the Mac OS X v10.5
    SDK</li>
  </ul>

<h3 id=jdk>Java Development Kit (JDK)</h3>

<p>Please note, since there are no available supported OpenJDK 8 packages for
  Ubuntu 14.04, the Ubuntu 15.04 packages must be installed manually. See <a
  href="initializing.html#for-ubuntu-14-04">JDK for Ubuntu LTS 14.04</a> for precise instructions.</p>
  <ul>
    <li>The master branch of Android in AOSP: Ubuntu - <a
    href="http://openjdk.java.net/install/">OpenJDK 8</a>, Mac OS - <a
    href="http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html#jdk-8u45-oth-JPR">jdk
    8u45 or newer</a></li>
    <li>Android 5.x (Lollipop) - Android 6.0 (Marshmallow): Ubuntu - <a
    href="http://openjdk.java.net/install/">OpenJDK 7</a>, Mac OS - <a
    href="https://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html#jdk-7u71-oth-JPR">jdk-7u71-macosx-x64.dmg</a></li>
    <li>Android 2.3.x (Gingerbread) - Android 4.4.x (KitKat): Ubuntu - <a
    href="http://www.oracle.com/technetwork/java/javase/archive-139210.html">Java JDK 6</a>, Mac OS - <a
    href="http://support.apple.com/kb/dl1572">Java JDK 6</a></li>
    <li>Android 1.5 (Cupcake) - Android 2.2.x (Froyo): Ubuntu - <a
    href="http://www.oracle.com/technetwork/java/javase/archive-139210.html">Java JDK 5</a></li>
  </ul>

<h3 id=packages>Key packages</h3>
  <ul>
    <li>Python 2.6 -- 2.7 from <a href="http://www.python.org/download/">python.org</a></li>
    <li>GNU Make 3.81 -- 3.82 from <a
    href="http://ftp.gnu.org/gnu/make/">gnu.org</a>; Android 3.2.x (Honeycomb) and
    earlier will need to <a href="initializing.html#reverting-from-make-382">revert
    from make 3.82</a> to avoid build errors</li>
    <li>Git 1.7 or newer from <a href="http://git-scm.com/download">git-scm.com</a></li>
  </ul>

<h3 id=binaries>Device binaries</h3>
<p>Download previews, factory images, drivers, over-the-air (OTA) updates, and
other blobs below. See <a
href="{@docRoot}source/building.html#obtaining-proprietary-binaries">Obtaining
proprietary binaries<a> for additional details.</p>
  <ul>
    <li><a
    href="https://developers.google.com/android/nexus/blobs-preview">Preview
    binaries (blobs)</a> - for AOSP <code>master</code> branch development</li>
    <li><a href="https://developers.google.com/android/nexus/images">Factory
    images</a> - for the supported devices running tagged AOSP release
    branches</li>
    <li><a href="https://developers.google.com/android/nexus/drivers">Binary
    hardware support files</a> - for devices running tagged AOSP release
    branches</li>
    <li><a href="https://developers.google.com/android/nexus/ota">OTA images</a>
    - for manually updating Nexus devices over the air</li>
  </ul>