Well, it’s so funny that there’s no clue to install it in the package downloaded from their homepage. As one guy felt angry with it here AngryPets.com :: Blog, I felt angry too ^_^!
So, very simple, the solution is just “Just copy everything in the NantContrib\bin directory into Nant\bin“.
Another way is to add some below script to the beginning of your NAnt script, says that you installed NAntContrib to “C:/Program Files/NAntContrib“.
<loadtasks> <fileset> <include name="C:/Program Files/NAntContrib/bin/**/*.dll" /> </fileset> </loadtasks>
D… it NAntContrib :D.