libIDL-config

[Andy]

> called nvu.  It requires libIDL-config, but I can't find it anywhere.
> There is a libidl package, but no libidl-dev, which I'm guessing would
> be the one I need.

Strange - if I openb synaptic I can see it listed - even without the 
"universe" (unsupported) repositories enabled. You could try enabling 
"universe" (settings -> repositories, then edit -> reload package list) 
but I believe it's in main so you should find it. Maybe just try 
reloading the package list first - you may then find it.

HTH

Andy