diff -r d8ca76573eb3 -r 8a144437db7d m4/lx_check_cplex.m4
--- a/m4/lx_check_cplex.m4	Tue Apr 28 13:38:06 2009 +0100
+++ b/m4/lx_check_cplex.m4	Mon Apr 27 20:02:37 2009 +0100
@@ -61,7 +61,7 @@
     LIBS="$lx_save_libs"
 
     if test x"$lx_cplex_found" = x"yes"; then
-      AC_DEFINE([HAVE_CPLEX], [1], [Define to 1 if you have CPLEX.])
+      AC_DEFINE([LEMON_HAVE_CPLEX], [1], [Define to 1 if you have CPLEX.])
       AC_MSG_RESULT([yes])
     else
       CPLEX_CFLAGS=""