chrooting package build process possible?

[Edward Lopez-Acosta]

I have noticed that when building packages I am required to install 
dependencies globally which leads to a messy system if I don't remember 
to remove them. This is an issue when building ports that may not be 
installed on the same system.

Is it possible to somehow have the make process use a chroot and avoid 
installing packages globally? Slight tangent, but why do 
pkg_add/pkg_delete not prompt to confirm before taking actions which to 
me would make much more sense than just doing the action right away.

Thank you.