You probably already have a C++ compiler on your Debian system. The packages you would need anyway are gcc, cpp, g++, libc6-dev, libx11-dev, make and gdb.
apt-get install gcc cpp g++ libc6-dev libx11-dev make gdb
TODO Debian testing required? Package names?
You can download the source package qt-x11-opensource-src-4.1.4.tar.gz for Linux from http://www.trolltech.com/developer/downloads/qt/x11.
You need to extract the package, configure it, build it and finally set the environment variables, so that you will be able to build Calitko and other Qt applications. The following steps should be familiar to you if you have ever installed anything from source under Linux:
$ tar –xzf qt-x11-opensource-src-4.1.4.tar.gz $ cd qt-x11-opensource-src-4.1.4 $ ./configure $ make $ su -c "make install"
Lastly, you would like to add the path to your Qt binaries to the environment variable PATH. A bash example:
PATH=/usr/local/Trolltech/Qt-4.1.4/bin:$PATH export PATH