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As of version 4.0rc1 you first need to compile and install libktorrent before you do ktorrent:

tar -xvjf libktorrent-1.X.Y.tar.bz2
cd libktorrent-1.X.Y
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=`kde4-config --prefix` ..
make
sudo make install

Compiling and installing ktorrent:

tar -xvjf ktorrent-4.X.Y.tar.bz2
cd ktorrent-4.X.Y
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=`kde4-config --prefix` ..
make
sudo make install

You will need to install cmake and all the necessary development packages (Qt,KDE,libgmp,QCA2), to get it compiled properly.

Compiling 2.2.8 is a bit different :

tar -xvjf ktorrent-X.Y.tar.bz2
cd ktorrent-X.Y
./configure
make
make install

If you want really fast compilation times, you should use ./configure --enable-final instead of
./configure

People on Mac OS X who have trouble compiling should try the following:

configure --prefix=/sw
sed -i -e 's/^whole_archive_flag_spec=.*/whole_archive_flag_spec=""/g;'
libtool
make
sudo make install

Thanks to Borre Gaup for bringing this to our attention. The problem is also explained here, other software might have the same problem.

Note : official SUSE packages for ktorrent >= 2.0 are crippled, SUSE disables DHT functionality for legal reasons (see https://bugzilla.novell.com/show_bug.cgi?id=205390)

Note : A lot of distros make their own KTorrent packages, some of them are pretty fast (like Fedora) to upgrade to the latest version of KTorrent. So with a bit of luck you should be able to find a recent KTorrent version in your distro's package management system (apt, up2date, emerge, ...).

Older versions

You can find older versions of KTorrent at http://ktorrent.org/downloads.