Symbol undefined

[Martijn Pot]

I'm starting to use D out of curiousity. I've used both Eclipse + 
DDT and Visual Studio + visualD and both give the same error in 
my second test program (second to Hello World of course...) using 
the Transmogrifier/CardboardBox example from TDPL :

 Error 42: Symbol Undefined 
_D1a14Transmogrifier12transmogrifyMFZv (void 
a.Transmogrifier.transmogrify())

Am I not linking module a (containing Transmogrifier and 
CardboardBox)? How can I get either or both IDE's running my test 
program?