diff --git a/include/PowerTools++/Model.h b/include/PowerTools++/Model.h
index 53be216..e5c37d9 100644
--- a/include/PowerTools++/Model.h
+++ b/include/PowerTools++/Model.h
@@ -81,7 +81,7 @@ class Model {
     void update_hess_link();    
     var_* getVar(int vid);
     void delVar(var_* v);
-    void addConstraint(Constraint c);
+    void addConstraint(const Constraint& c);
     void addConstraint(Constraint* c);
     void on_off(Constraint c, var<bool>& on);
     void on_off(var<>& v, var<bool>& on);
diff --git a/include/PowerTools++/PTSolver.h b/include/PowerTools++/PTSolver.h
index 42dabd3..eb833ac 100644
--- a/include/PowerTools++/PTSolver.h
+++ b/include/PowerTools++/PTSolver.h
@@ -39,6 +39,6 @@ class PTSolver {
     /* Destructor */
     ~PTSolver();
     
-    int run(int output, bool relax);
+    int run(int output, bool relax, int print_lvl=5);
 };
 #endif /* defined(__PowerTools____Solver__) */
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 387fd55..4fe337a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,7 +10,7 @@ find_library(BLAS_LIBRARIES NAMES blas coinblas PATHS ENV LIBRARY_PATH)
 find_library(LAPACK_LIBRARIES NAMES lapack coinlapack PATHS ENV LIBRARY_PATH)
 find_library(MUMPS_LIBRARIES NAMES coinmumps PATHS ENV LIBRARY_PATH)
 add_library(PowerTools++ ${SOURCES} ${HEADERS})
-target_link_libraries(PowerTools++ ${GUROBI_LIBRARIES} ${BLAS_LIBRARIES} ${LAPACK_LIBRARIES} ${IPOPT_LIBRARIES} dl coinhsl coinmetis ${MUMPS_LIBRARIES})
+target_link_libraries(PowerTools++ ${GUROBI_LIBRARIES} ${BLAS_LIBRARIES} ${LAPACK_LIBRARIES} ${IPOPT_LIBRARIES} dl)
 
 
 add_executable(PowerTools main.cpp)
diff --git a/src/IpoptProgram.cpp b/src/IpoptProgram.cpp
index e3f69f7..f3c9bcb 100644
--- a/src/IpoptProgram.cpp
+++ b/src/IpoptProgram.cpp
@@ -93,7 +93,7 @@ void IpoptProgram::finalize_solution(    Ipopt::SolverReturn               statu
     }
 //    model->check_feasible(x);
     model->_opt = model->_obj->eval(x);
-    cout << "\n************** Objective Function Value = " << model->_opt << " **************" << endl;
+    //cout << "\n************** Objective Function Value = " << model->_opt << " **************" << endl;
 }
 
 bool IpoptProgram::get_bounds_info(Index n, Number* x_l, Number* x_u,
diff --git a/src/Model.cpp b/src/Model.cpp
index f821349..015b984 100644
--- a/src/Model.cpp
+++ b/src/Model.cpp
@@ -173,7 +173,7 @@ void Model::delVar(var_* v){
     assert(false);
 };
 
-void Model::addConstraint(Constraint c_){
+void Model::addConstraint(const Constraint &c_){
     Constraint* c = new Constraint(c_);
     _cons.push_back(c);
     c->set_idx(_idx_con++);
diff --git a/src/PTSolver.cpp b/src/PTSolver.cpp
index c9c7598..85717f1 100644
--- a/src/PTSolver.cpp
+++ b/src/PTSolver.cpp
@@ -66,7 +66,7 @@ void PTSolver::set_model(Model* m) {
 }
 
 
-int PTSolver::run(int output, bool relax){
+int PTSolver::run(int output, bool relax, int print_lvl){
     //GurobiProgram* grbprog;
     // Initialize the IpoptApplication and process the options
 
@@ -89,7 +89,9 @@ int PTSolver::run(int output, bool relax){
 //                        iapp.Options()->SetNumericValue("tol", 1e-6);
             //            iapp->Options()->SetStringValue("derivative_test", "second-order");
             //            iapp.Options()->SetNumericValue("bound_relax_factor", 0);
-            //            iapp.Options()->SetIntegerValue("print_level", 5);
+                        iapp.Options()->SetIntegerValue("print_level", print_lvl);
+                        if (print_lvl == 0) // stop printing of banner
+                            iapp.Options()->SetStringValue("sb", "yes");
             
             //            iapp.Options()->SetStringValue("derivative_test_print_all", "yes");
         status = iapp.OptimizeTNLP(tmp);