How to compile and install QEMU version 2.1.0 or greater

$qemu-system-x86_64 --version

$sudo apt-get install build-essential zlib1g-dev

$sudo apt-get --no-install-recommends -y build-dep qemu

$wget http://wiki.qemu-project.org/download/qemu-2.1.0.tar.bz2

$tar -xvf qemu-2.1.0.tar.bz2

$cd qemu-2.1.0/

$./configure

$make

$sudo make install