In debian testing and sid and in the ubuntu packages are in the official repositories.

sudo apt-get install psi-plus psi-plus-plugins psi-plus-icons psi-plus-skins

Your system may not be QtCrypto and QtDev>=4.6.0. If you do not - they must be installed prior to build.

Install packages to build Psi +. Installed once at the first build:

sudo apt-get install git-core qt4-dev-tools libqt4-dev build-essential subversion patch

Remove previous build to clean build:

cd ~
rm -rf psi

Download the Psi source code and submodules from git:

git clone git://git.psi-im.org/psi.git
cd psi
git submodule update --init

The resulting directory can be saved and then run the commands in this directory you can get the latest version Psi:

git pull
git submodule update

Download all patches and applies them to the Psi source code:

cd ~
svn co http://psi-dev.googlecode.com/svn/trunk/patches/ psi
cd psi
cat *.diff|patch -p1

Download iconsets and type current revision in Psi:

svn export --force http://psi-dev.googlecode.com/svn/trunk/iconsets/system/default iconsets/system/default
svn export --force http://psi-dev.googlecode.com/svn/trunk/iconsets/roster/default iconsets/roster/default
rev=`svnversion`
sed "s/\(xxx\)/${rev}/" -i src/applicationinfo.cpp

Building Psi+ and install (root privileges needed to install):

qconf && ./configure --enable-plugins && make && sudo make install

Note! If the qconf not installed you must be independently download it from the official site and build it.

If the command ./configure get an qtcore error, then we write:

qmake-qt4 --version

Look at the path and then run ./configure with the parameter:

./configure --qtdir=<path>

Most likely it will be:

./configure --qtdir=/usr/bin

If you need to install additional emoticons, icons and customer moods and/or Russian localization, then do the following.

cd /usr/local/share/psi
rm -rf iconsets
svn co http://psi-dev.googlecode.com/svn/trunk/iconsets iconsets

Previous operation is done once, at the first build. Then it will be enough to do:

cd /usr/local/share/psi/iconsets
svn up

cd /usr/local/share
svn co http://psi-ru.googlecode.com/svn/branches/psi-plus psi

Previous operation is done once, at the first build. Then it will be enough to do:

cd /usr/local/share/psi
svn up

Consider the example of Gmail Service Plugin:

cd ~/psi/src/plugins/generic
svn co http://psi-dev.googlecode.com/svn/trunk/plugins/generic/gmailserviceplugin gmailserviceplugin
cd gmailserviceplugin
qmake gmailserviceplugin.pro
make
mkdir /usr/local/share/psi/plugins
cp libgmailserviceplugin.so /usr/local/share/psi/plugins

Enjoy