diff -r caf16813b1e8 -r 1782aa72495a lemon/glpk.cc
--- a/lemon/glpk.cc	Sat Jul 21 10:18:57 2012 +0200
+++ b/lemon/glpk.cc	Fri Jul 20 17:09:01 2012 +0200
@@ -582,6 +582,15 @@
     }
   }
 
+  void GlpkBase::_write(std::string file, std::string format) const
+  {
+    if(format == "MPS")
+      glp_write_mps(lp, GLP_MPS_FILE, 0, file.c_str());
+    else if(format == "LP")
+      glp_write_lp(lp, 0, file.c_str());
+    else throw UnsupportedFormatError(format);
+  }
+
   GlpkBase::FreeEnvHelper GlpkBase::freeEnvHelper;
 
   // GlpkLp members
@@ -998,4 +1007,6 @@
 
   const char* GlpkMip::_solverName() const { return "GlpkMip"; }
 
+
+
 } //END OF NAMESPACE LEMON