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Get the necessary system software/packages installed on your system, see http://hg.openjdk.java.net/jdk8/jdk8/raw-file/tip/README-builds.html
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If you don't have a jdk7u7 or newer jdk, download and install it from http://java.sun.com/javase/downloads/index.jsp Add the /bin directory of this installation to your PATH environment variable.
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Configure the build:
bash ./configure -
Build the OpenJDK:
make all
where make is GNU make 3.81 or newer, /usr/bin/make on Linux usually is 3.81 or newer. Note that on Solaris, GNU make is called "gmake".
The resulting JDK image should be found in build/*/images/j2sdk-image