[Ipopt] Ipopt include files

[Brad Bell]

I have a template class header file that includes the files
     # include <coin/IpIpoptApplication.hpp>
     # include <coin/IpTNLP.hpp>

I never use the template class, so even though I define it, I do not 
expect to need Ipopt to link the corresponding program. The problem is 
that it appears that the Ipopt include files listed above are not pure 
definitions; i.e., they are actually building code that requires the 
Ipopt library to link ?