Run-time initialised static variables

[dekevin via Digitalmars-d-learn]

Hello everyone,
I just ran into the problem, that I need a static variable, where 
the initialisation code for that variable is only accessible 
during run-time (since part of the initialisation code will be 
dynamically linked).

Is there a way to do this in D?

To be a bit more concrete, this is where I have the problem 
(where ℚ uses GMP, which is dynamically linked):

struct ℚInf {
   ℚ qval;
   immutable static ℚInf zero = ℚInf(0,1);
   this(long num, long den) {
        qval = ℚ(num,den); //this initialisation requires 
dynamically linked code
    }
}