diff --git a/lemon/soplex.cc b/lemon/soplex.cc
--- a/lemon/soplex.cc
+++ b/lemon/soplex.cc
@@ -19,7 +19,8 @@
 #include <iostream>
 #include <lemon/soplex.h>
 
-#include <soplex/soplex.h>
+#include <soplex.h>
+#include <spxout.h>
 
 
 ///\file
@@ -28,6 +29,7 @@
 
   SoplexLp::SoplexLp() {
     soplex = new soplex::SoPlex;
+    messageLevel(MESSAGE_NOTHING);
   }
 
   SoplexLp::~SoplexLp() {
@@ -47,6 +49,7 @@
     _row_names = lp._row_names;
     _row_names_ref = lp._row_names_ref;
 
+    messageLevel(MESSAGE_NOTHING);
   }
 
   void SoplexLp::_clear_temporals() {
@@ -54,12 +57,12 @@
     _dual_values.clear();
   }
 
-  SoplexLp* SoplexLp::_newSolver() const {
+  SoplexLp* SoplexLp::newSolver() const {
     SoplexLp* newlp = new SoplexLp();
     return newlp;
   }
 
-  SoplexLp* SoplexLp::_cloneSolver() const {
+  SoplexLp* SoplexLp::cloneSolver() const {
     SoplexLp* newlp = new SoplexLp(*this);
     return newlp;
   }
@@ -88,6 +91,19 @@
     return soplex->nRows() - 1;
   }
 
+  int SoplexLp::_addRow(Value l, ExprIterator b, ExprIterator e, Value u) {
+    soplex::DSVector v;
+    for (ExprIterator it = b; it != e; ++it) {
+      v.add(it->first, it->second);
+    }
+    soplex::LPRow r(l, v, u);
+    soplex->addRow(r);
+
+    _row_names.push_back(std::string());
+
+    return soplex->nRows() - 1;
+  }
+
 
   void SoplexLp::_eraseCol(int i) {
     soplex->removeCol(i);
@@ -271,6 +287,8 @@
   SoplexLp::SolveExitStatus SoplexLp::_solve() {
 
     _clear_temporals();
+    
+    _applyMessageLevel();
 
     soplex::SPxSolver::Status status = soplex->solve();
 
@@ -419,5 +437,29 @@
     _clear_temporals();
   }
 
+  void SoplexLp::_messageLevel(MessageLevel level) {
+    switch (level) {
+    case MESSAGE_NOTHING:
+      _message_level = -1;
+      break;
+    case MESSAGE_ERROR:
+      _message_level = soplex::SPxOut::ERROR;
+      break;
+    case MESSAGE_WARNING:
+      _message_level = soplex::SPxOut::WARNING;
+      break;
+    case MESSAGE_NORMAL:
+      _message_level = soplex::SPxOut::INFO2;
+      break;
+    case MESSAGE_VERBOSE:
+      _message_level = soplex::SPxOut::DEBUG;
+      break;
+    }
+  }
+
+  void SoplexLp::_applyMessageLevel() {
+    soplex::Param::setVerbose(_message_level);
+  }
+
 } //namespace lemon