--- CBOR-XS/XS.xs	2013/10/28 22:50:50	1.13
+++ CBOR-XS/XS.xs	2013/10/29 15:56:32	1.14
@@ -11,6 +11,17 @@
 
 #include "ecb.h"
 
+// compatibility with perl <5.18
+#ifndef HvNAMELEN_get
+# define HvNAMELEN_get(hv) strlen (HvNAME (hv))
+#endif
+#ifndef HvNAMELEN
+# define HvNAMELEN(hv) HvNAMELEN_get (hv)
+#endif
+#ifndef HvNAMEUTF8
+# define HvNAMEUTF8(hv) 0
+#endif
+
 // known tags
 enum cbor_tag
 {