Fix again for failures in building on machines without EIGEN3.

src/DCPSE/Dcpse.hpp

@@ -5,6 +5,8 @@
 #ifndef OPENFPM_PDATA_DCPSE_HPP
 #define OPENFPM_PDATA_DCPSE_HPP
 
+#ifdef HAVE_EIGEN
+
 #include "Vector/vector_dist.hpp"
 #include "MonomialBasis.hpp"
 #include "../../openfpm_numerics/src/DMatrix/EMatrix.hpp"
@@ -269,5 +271,6 @@ void Dcpse<dim, T, list...>::initializeStaticSize(vector_dist<dim, T, aggregate<
     }
 }
 
+#endif // HAVE_EIGEN
 
 #endif //OPENFPM_PDATA_DCPSE_HPP