====This environment build on 64-bit ubuntu 12.04 system====
===Install JDK===
<code>
$ sudo gedit /etc/apt/sources.list
</code>
Add:
<code>
deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse
</code>
Inputin terminal:
<code>
$ sudo apt-get update
$ sudo apt-get install sun-java6-jdk
</code>
===Installing required packages (Ubuntu 12.04)===
Building on Ubuntu 12.04 is currently only experimentally supported and is not guaranteed to work on branches other than master.
<code>
$ sudo apt-get install git gnupg flex bison gperf build-essential \
  zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \
  libx11-dev:i386 libreadline6-dev:i386  \
  g++-multilib mingw32 tofrodos \
  python-markdown libxml2-utils xsltproc zlib1g-dev:i386
</code>