+/* Non positive return values are errors */
+#define X509_PCY_TREE_FAILURE -2 /* Failure to satisfy explicit policy */
+#define X509_PCY_TREE_INVALID -1 /* Inconsistent or invalid extensions */
+#define X509_PCY_TREE_INTERNAL 0 /* Internal error, most likely malloc */
+
+/*
+ * Positive return values form a bit mask, all but the first are internal to
+ * the library and don't appear in results from X509_policy_check().
+ */
+#define X509_PCY_TREE_VALID 1 /* The policy tree is valid */
+#define X509_PCY_TREE_EMPTY 2 /* The policy tree is empty */
+#define X509_PCY_TREE_EXPLICIT 4 /* Explicit policy required */
+