Mihai,

> thanks for clearing things up. guess I have to code the integration logic
> by hand (along the lines of the pre-MeshWorker version of step-12).

Actually, I think you probably *should* use the MeshWorker framework. The 
reason you get linker errors is simply because the classes you are missing 
are not instantiated for 1d, see for example the file 
deal.II/source/numerics/mesh_worker_info.cc. Instead of reinventing the 
wheel, let's just try to these instantiations work in 1d as well. 

So I've made things to at least compile in revision 21614. By simply disabling 
all face integration stuff since the FEFaceValues and FESubFaceValues classes 
don't work in 1d. Now, I'm under no illusion that things will work in 1d 
because integration has to work differently there. Can you try out how far 
you get when you use these classes in 1d and let us know where the next 
roadblock is? Maybe we can jointly figure out what to do about things.

Best
 Wolfgang

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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