-*- mode: outline; coding: utf-8; -*-

* Conf files.

See man sources.list(5), apt.conf(5).

 /etc/apt/sources.list
 /etc/apt/apt.conf

* Setup backport.

Main backports archive you can find on www.backports.org.

To get packeges gpg sign key:

  $ su
  ...
  $ wget -O - http://backports.org/debian/archive.key | apt-key add -
  $ ^D

Write where packeges places:

  $ cat /etc/apt/sources.list
  deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official amd64 DVD Binary-2 20070407-12:15]/ etch contrib main
  deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official amd64 DVD Binary-1 20070407-12:15]/ etch contrib main

  deb http://www.backports.org/debian/ etch-backports main contrib non-free

* Getting new keys for packages.

  $ sudo apt-get update
...
W: There is no public key available for the following key IDs:
9AA38DCD55BE302B
W: GPG error: http://http.us.debian.org etch Release: The following signatures
couldn't be verified because the public key is not available: NO_PUBKEY
9AA38DCD55BE302B
...

  $ gpg --keyserver pgp.mit.edu --recv-key 9AA38DCD55BE302B \
--keyserver-options http-proxy=http://user:pass@192.168.1.1:3128
gpg: requesting key 55BE302B from hkp server pgp.mit.edu
gpg: key 55BE302B: public key "Debian Archive Automatic Signing Key (5.0/lenny) <ftpmaster@debian.org>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)

  $ gpg --export 9AA38DCD55BE302B | sudo apt-key add -
OK

* Install build dependency for package.

  $ apt-get install build-essential    # install dev LIBC and GCC C/C++
  $ sudo apt-get build-dep $package

If all you want is checking what packages are needed to build a given package:

  $ apt-cache showsrc $package

or check 'Build-Depends' attribute in

  $ apt-cache show $package