How do I use cards.dll from Aonix OA?

["Petter Fryklund" <qsbpefr@esavionics.se>]

Does anybody have an Ada spec? How do I tell AO to reference the dll? I
thought that ie

with Interfaces.C;
with System;
package cdt is
function cdtInit (dx, dy : System.Address) return Interfaces.Unsigned_32;
pragma Import (C, cdtInit, External_Name => "cdtInit");
end cdt;

would do the job, but I get a linker errror, not being able to find cdtInit.
Any suggestions?