diff --git a/clucene.m4 b/clucene.m4
index e643e75..312a97a 100644
--- a/clucene.m4
+++ b/clucene.m4
@@ -48,6 +48,8 @@ if test "x$ac_cv_clucene_libdir" = "xNO"; then
   if test "x$ac_cv_clucene2_libdir" = "xNO"; then
     AC_MSG_ERROR(CLucene library not found. Try to use configure with --with-clucene-dir=/path/to/clucene);
   fi
+else
+  ac_cv_clucene2_libdir="NO"
 fi
 
 if test "x$ac_static_clucene" = "xYES"; then