How to remove build dependencies ("apt-get build-dep") automatically?

[Deephay <tudoxxx@gmail.com>]

Greetings all,

Since I have to add a missed configure option in the debian/rules of a
package, so I used "apt-get build-dep xxx" and "apt-get source xxx" in
order to build the package, the  "apt-get build-dep" installed a lot
of build-dep packages and I want to know that is there a way to purge
them? They have no further uses and seems they will not be purged
automatically.

Thanks,
Deephay