Step 1: 
sudo apt-get build-dep qemu

Step 2:
cd qemu-1.6-top
mkdir build && cd build
../myconfig && make install
cd bin && cp -r ../../data/* .

Step 3:
3.1 install ubuntu-11.04 in the guest OS in image ubuntu-11.04.qcow2:
	./qemu-img create -f qcow2 ubuntu-11.04.qcow2 5G
	./qemu-system-i386 -m 512 ./ubuntu-11.04.qcow2 -cdrom ubuntu-11.04.iso
3.2 run TOP platform:
	./qemu-system-i386 -m 512 ./ubuntu-11.04.qcow2
	scp the directory qemu-1.6-top/files to guest OS
	press ctr+alt+2 to switch to qemu command console and run: pemu env (to trace env program)
	press ctr+alt+1 to switch back to guest OS and run: cd files && ./env
3.3 run the generated files:
	scp qemu-1.6-top/build/bin/output_a.out to guest OS
	in guest OS, compile and run that program: gcc output_a.out && ./a.out