*ubuntuguide.org explains.dont use source compile.if at all u want to compile use a software called "checkinstall" from synaptic manager.
regarding pidgin update.there may be repositories set for latest pidgin ported for ubuntu search *ubuntuforums.org
also get ur /etc/apt/sources.list enabled(remove # in the start of lines beginning with "deb").below is my feisty sources.list.
Code:
# # If you get GPG errors with this sources.list, locate the GPG key in this file
# # and run these commands (where KEY is replaced with that key)
# #
# # gpg --keyserver hkp://subkeys.pgp.net --recv-keys KEY
# # gpg --export --armor KEY | sudo apt-key add -
#Ubuntu Security
deb *archive.ubuntu.com/ubuntu/ feisty-security main restricted
deb-src *archive.ubuntu.com/ubuntu/ feisty-security restricted main multiverse universe #Added by software-properties
deb *archive.ubuntu.com/ubuntu/ feisty-security universe
deb *archive.ubuntu.com/ubuntu/ feisty-security multiverse
# # Ubuntu supported packages
# # GPG key: 437D05B5
deb *archive.ubuntu.com/ubuntu/ feisty main restricted
deb-src *archive.ubuntu.com/ubuntu/ feisty restricted main multiverse universe #Added by software-properties
deb *archive.ubuntu.com/ubuntu/ feisty-updates main restricted
deb-src *archive.ubuntu.com/ubuntu/ feisty-updates restricted main multiverse universe #Added by software-properties
#
# # Ubuntu community supported packages
# # GPG key: 437D05B5
deb *archive.ubuntu.com/ubuntu/ feisty universe multiverse
deb *archive.ubuntu.com/ubuntu/ feisty-updates universe multiverse
# # Ubuntu backports project
# # GPG key: 437D05B5
deb *archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src *archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse #Added by software-properties
#### Proposed Multiverse ####
deb *archive.ubuntu.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src *archive.ubuntu.com/ubuntu/ feisty-proposed main restricted universe multiverse #Added by software-properties
#### Canonical Commercial ####
deb *archive.canonical.com/ubuntu feisty-commercial main
deb *medibuntu.sos-sts.com/repo/ feisty free non-free
#compiz-fusion
deb *debs.vorian.org/ feisty extras
deb-src *debs.vorian.org/ feisty extras
dont remove the first two lines for ur feisty cd in sources.list.
once the sources.list is saved and exit,open synaptic and press reload when internet is ON.