Build aziz-mdimporter and create a symlink in ~/Library/Spotlight:
cd ~/Library/Spotlight
ln -s /Users/rasmus/src/aziz/build/Debug/aziz.mdimporter
Build aziz-simbl and create a symlink into SIMBL plugins:
cd ~/Library/Application Support/SIMBL/Plugins
ln -s ~/src/aziz/build/Debug/aziz.bundle
Restart Spotlight
killall Spotlight
Now, try to search for something in Spotlight