README: 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/ See http://openjdk.java.net/ for more information about the OpenJDK.Simple Build Instructions: 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: gnumake sanity See README-builds.html if you run into problems. 3. Do a complete build of the OpenJDK: gnumake all The resulting JDK image should be found in build/*/j2sdk-imagewhere gnumake is GNU make 3.81 or newer, /usr/bin/make on Linux and/usr/sfw/bin/gmake or /opt/sfw/bin/gmake on Solaris.