diff --git a/lemon/config.h.in b/lemon/config.h.in
--- a/lemon/config.h.in
+++ b/lemon/config.h.in
@@ -1,23 +1,23 @@
 /* Define to 1 if you have long long */
-#undef HAVE_LONG_LONG
+#undef LEMON_HAVE_LONG_LONG
 
 /* Define to 1 if you have any LP solver. */
-#undef HAVE_LP
+#undef LEMON_HAVE_LP
 
 /* Define to 1 if you have any MIP solver. */
-#undef HAVE_MIP
+#undef LEMON_HAVE_MIP
 
 /* Define to 1 if you have CPLEX. */
-#undef HAVE_CPLEX
+#undef LEMON_HAVE_CPLEX
 
 /* Define to 1 if you have GLPK. */
-#undef HAVE_GLPK
+#undef LEMON_HAVE_GLPK
 
 /* Define to 1 if you have SOPLEX */
-#undef HAVE_SOPLEX
+#undef LEMON_HAVE_SOPLEX
 
 /* Define to 1 if you have CLP */
-#undef HAVE_CLP
+#undef LEMON_HAVE_CLP
 
 /* Define to 1 if you have CBC */
-#undef HAVE_CBC
+#undef LEMON_HAVE_CBC