> To repeat the error, I split the step-13.cc example into 3 files:
>
> include/evaluation.h
> source/evaluation.cc
> source/step-13.cc
>
> I get the following:
> [...]

It's hard to tell where the error is exactly without knowing what you did, 
but my best guess is that you put all implementations of the functions in 
the Evaluation namespace into the evaluation.cc file. But then all you 
have in there are templated -- so nothing is actually compiled into the 
object file when you compile the file. You would have to add explicit 
instantiations of the templates to the bottom of the file, like

namespace Evaluation {
  template class SolutionOutput<2>;
}

or some such thing. Does this help?

Best
 W.

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


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