KDevelop 3.0 is still in the alpha stage. The packages for it were previously called gideon gideon-data gideon-plugins gideon-doc gideon-dev
The packages are now called kdevelop kdevelop-data kdevelop-plugins kdevelop-doc kdevelop-dev For Debian stable, the apt-get source lines are: deb http://people.debian.org/~njordan stable main deb-src http://people.debian.org/~njordan/stable source/ For Debian unstable, the apt-get source lines are: deb http://people.debian.org/~njordan unstable main deb-src http://people.debian.org/~njordan/unstable source/ Thanks.