diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,9 @@
 #LX_CHECK_CPLEX
 #LX_CHECK_SOPLEX
 
+AM_CONDITIONAL([HAVE_LP], [test x"$lx_lp_found" = x"yes"])
+AM_CONDITIONAL([HAVE_MIP], [test x"$lx_mip_found" = x"yes"])
+
 dnl Disable/enable building the demo programs.
 AC_ARG_ENABLE([demo],
 AS_HELP_STRING([--enable-demo], [build the demo programs])
diff --git a/lemon/config.h.in b/lemon/config.h.in
--- a/lemon/config.h.in
+++ b/lemon/config.h.in
@@ -1,3 +1,9 @@
+/* Define to 1 if you have any LP solver. */
+#undef HAVE_LP
+
+/* Define to 1 if you have any MIP solver. */
+#undef HAVE_MIP
+
 /* Define to 1 if you have CPLEX. */
 #undef HAVE_CPLEX
 
diff --git a/m4/lx_check_cplex.m4 b/m4/lx_check_cplex.m4
--- a/m4/lx_check_cplex.m4
+++ b/m4/lx_check_cplex.m4
@@ -62,6 +62,10 @@
 
     if test x"$lx_cplex_found" = x"yes"; then
       AC_DEFINE([HAVE_CPLEX], [1], [Define to 1 if you have CPLEX.])
+      lx_lp_found=yes
+      AC_DEFINE([HAVE_LP], [1], [Define to 1 if you have any LP solver.])
+      lx_mip_found=yes
+      AC_DEFINE([HAVE_MIP], [1], [Define to 1 if you have any MIP solver.])
       AC_MSG_RESULT([yes])
     else
       CPLEX_CFLAGS=""
diff --git a/m4/lx_check_glpk.m4 b/m4/lx_check_glpk.m4
--- a/m4/lx_check_glpk.m4
+++ b/m4/lx_check_glpk.m4
@@ -60,6 +60,10 @@
 
     if test x"$lx_glpk_found" = x"yes"; then
       AC_DEFINE([HAVE_GLPK], [1], [Define to 1 if you have GLPK.])
+      lx_lp_found=yes
+      AC_DEFINE([HAVE_LP], [1], [Define to 1 if you have any LP solver.])
+      lx_mip_found=yes
+      AC_DEFINE([HAVE_MIP], [1], [Define to 1 if you have any MIP solver.])
       AC_MSG_RESULT([yes])
     else
       GLPK_CFLAGS=""
diff --git a/m4/lx_check_soplex.m4 b/m4/lx_check_soplex.m4
--- a/m4/lx_check_soplex.m4
+++ b/m4/lx_check_soplex.m4
@@ -56,6 +56,8 @@
 
     if test x"$lx_soplex_found" = x"yes"; then
       AC_DEFINE([HAVE_SOPLEX], [1], [Define to 1 if you have SOPLEX.])
+      lx_lp_found=yes
+      AC_DEFINE([HAVE_LP], [1], [Define to 1 if you have any LP solver.])
       AC_MSG_RESULT([yes])
     else
       SOPLEX_CXXFLAGS=""