Only include the Riemannian Proximal Newton Solver for dune-solvers >= 2.8

src/cosserat-continuum.cc

@@ -56,7 +56,9 @@
 #include <dune/gfe/mixedriemanniantrsolver.hh>
 #else
 #include <dune/gfe/geodesicfeassemblerwrapper.hh>
+#if DUNE_VERSION_GTE(DUNE_SOLVERS, 2, 8)
 #include <dune/gfe/riemannianpnsolver.hh>
+#endif
 #include <dune/gfe/riemanniantrsolver.hh>
 #include <dune/gfe/rigidbodymotion.hh>
 #endif
@@ -575,7 +577,7 @@ int main (int argc, char *argv[]) try
                 solver.solve();
                 xTargetSpace = solver.getSol();
             } else { //parameterSet.get<std::string>("solvertype") == "proximalNewton"
-#if DUNE_VERSION_LT(DUNE_COMMON, 2, 8)
+#if DUNE_VERSION_LT(DUNE_SOLVERS, 2, 8)
                 DUNE_THROW(Exception, "Please install dune-solvers >= 2.8 to use the Proximal Newton Solver with Cholmod!");
 #else
                 RiemannianProximalNewtonSolver<DeformationFEBasis, TargetSpace> solver;