oops, test is always true

configure.ac

@@ -1490,7 +1490,7 @@ AC_DEFINE_UNQUOTED(STARPU_MAXIMPLEMENTATIONS, [$maximplementations],
 AC_LANG_PUSH([C++])
 AC_CHECK_HEADERS([leveldb/db.h], [AC_DEFINE([STARPU_HAVE_LEVELDB], [1], [Define to 1 if you have the <leveldb/db.h> header file.])])
 STARPU_HAVE_LIBRARY(LEVELDB, [leveldb])
-AM_CONDITIONAL(STARPU_HAVE_LEVELDB, test ac_cv_header_leveldb_db_h)
+AM_CONDITIONAL(STARPU_HAVE_LEVELDB, test "x$ac_cv_lib_leveldb_main" = "xyes")
 AC_LANG_POP([C++])