parsing WITH SYNTAX clauses

diff --git a/libasn1parser/asn1parser.h b/libasn1parser/asn1parser.h
index fc8de37..ceb099e 100644
--- a/libasn1parser/asn1parser.h
+++ b/libasn1parser/asn1parser.h
@@ -69,4 +69,6 @@
 asn1p_t	*asn1p_parse_buffer(const char *buffer, int size /* = -1 */,
 	enum asn1p_flags);
 
+int asn1p_atoi(const char *ptr, asn1c_integer_t *r_value);
+
 #endif	/* ASN1PARSER_H */