SPARK Demo Irrlicht - Unresolved externals

I've compiled the SPARK engine successfully, but am getting 33 unresolved externals on the IRRBasicDemo build:-

error LNK2019; unresolved external symbol... SPK::SPKFactory::destroyAll(void)
plus SPK::System, ::Group, ::Emitter
...

I've set Lib Directories to spark engine vc2008\static, where the debug lib is.

Any ideas?

[Edit] - I opened the Spark_debug.lib and checked that the unresolved externals are all defined within.  If I remove Spark_debug.lib from the linker input on the IRRBasicDemo, I get a warning the lib can't be opened but not the unresolved.

So the lib is loaded, the functions are within, but they still list as unresolved in the demo... what could it be?