This file should be located at the top of the OpenJDK Mercurial root

  repository. This root repository will include a "make" directory,

  and a Makefile for building the entire OpenJDK.

  A full OpenJDK repository set (forest) should also include the following

  6 nested repositories:

    "jdk", "hotspot", "langtools", "corba", "jaxws"  and "jaxp".

  There are also several source downloads for the jax* repositories that

  will be needed.

  This one root repository can be obtained with something like:

    hg clone http://hg.openjdk.java.net/jdk7/jdk7 openjdk7

  To make sure you have all the nested repositories, you can run:

    cd openjdk7 && sh ./get_source.sh

  (This is identical to using the Mercurial Forest Extension command 

   'hg fclone http://hg.openjdk.java.net/jdk7/jdk7 openjdk7').

  People unfamiliar with Mercurial should read the first few chapters of

  the Mercurial book: http://hgbook.red-bean.com/read/

  0. Get the necessary system software/packages installed on your system, see

     http://hg.openjdk.java.net/jdk7/build/raw-file/tip/README-builds.html

  1. If you don't have a jdk6 installed, download and install a JDK 6 from

     http://java.sun.com/javase/downloads/index.jsp

     Set the environment variable ALT_BOOTDIR to the location of JDK 6.

  2. Check the sanity of doing a build with your current system:

  3. Do a complete build of the OpenJDK: