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I got this nice answer from other source:

Eigen is a header only library (save for some blas bindings). The only way to make sure Eigen isn't required as a build time dependency when your library is used is to only include Eigen headers in your library's source files, and none in your headers. This may require some wrapping of Eigen types and functions with PIMPL or some such.

If this is the case already, your question is missing information.