Build Xen 4.1.2 on ubuntu 11.04

Looks like easy from the README, but turns out to be tedious package find and see game. The "chk build" and "chk install" don't help much. Even you get all "OK", still not ok. So I just list all the packages I found necessary here :

sudo apt-get install libc6-dev-i386 bin86 bcc bridge-utils build-essential libncurses5-dev dpkg-dev debhelper fakeroot uuid-dev iasl texinfo git-core python-dev 

Hope this can save you a few minutes :)