Comment 2 for bug 809400

Yay, that's a way to go. Insult all the people who could possibly help you.

I don't see any bug here. If you really don't have any other machine and you have to do the bad thing called "mixing production and development environment" then you can use debootstrap to create chroot to isolate the build environment. Or better you pbuilder or cowbuilder, which are specifically created to solve this problem.