diff --git a/lemon/lp.h b/lemon/lp.h
--- a/lemon/lp.h
+++ b/lemon/lp.h
@@ -22,13 +22,13 @@
 #include<lemon/config.h>
 
 
-#ifdef HAVE_GLPK
+#ifdef LEMON_HAVE_GLPK
 #include <lemon/glpk.h>
-#elif HAVE_CPLEX
+#elif LEMON_HAVE_CPLEX
 #include <lemon/cplex.h>
-#elif HAVE_SOPLEX
+#elif LEMON_HAVE_SOPLEX
 #include <lemon/soplex.h>
-#elif HAVE_CLP
+#elif LEMON_HAVE_CLP
 #include <lemon/clp.h>
 #endif
 
@@ -69,20 +69,20 @@
   ///Currently, it is either \c GlpkMip or \c CplexMip
   typedef GlpkMip Mip;
 #else
-#ifdef HAVE_GLPK
+#ifdef LEMON_HAVE_GLPK
 # define LEMON_DEFAULT_LP GLPK
   typedef GlpkLp Lp;
 # define LEMON_DEFAULT_MIP GLPK
   typedef GlpkMip Mip;
-#elif HAVE_CPLEX
+#elif LEMON_HAVE_CPLEX
 # define LEMON_DEFAULT_LP CPLEX
   typedef CplexLp Lp;
 # define LEMON_DEFAULT_MIP CPLEX
   typedef CplexMip Mip;
-#elif HAVE_SOPLEX
+#elif LEMON_HAVE_SOPLEX
 # define DEFAULT_LP SOPLEX
   typedef SoplexLp Lp;
-#elif HAVE_CLP
+#elif LEMON_HAVE_CLP
 # define DEFAULT_LP CLP
   typedef ClpLp Lp;  
 #endif