You need to checkout the darcs repositories:

cd SOME_DIR
for r in smoke qt.core qt.gui qt.network qt.test qt.tests qt.examples qt.uitools qt.webkit qt.phonon; do
	darcs get "http://tobias.rautenkranz.ch/lisp/cl-smoke/$r"
done
	

Build and install the :smoke and :qt.core C wrapper libraries with:

cmake ./ && make && sudo make install

in the smoke/ and qt/ directories.

When you have symlinked the .asd system files, you should be able to load the systems. The system name has a :cl-smoke. prefix. e.g.:

(asdf:oos 'asdf:load-op :cl-smoke.qt.examples)