=== modified file 'duplicity/_librsyncmodule.c'
--- duplicity/_librsyncmodule.c	2014-05-07 12:51:00 +0000
+++ duplicity/_librsyncmodule.c	2015-05-01 12:46:43 +0000
@@ -67,8 +67,13 @@
   sm = PyObject_New(_librsync_SigMakerObject, &_librsync_SigMakerType);
   if (sm == NULL) return NULL;
 
+#ifdef RS_DEFAULT_STRONG_LEN /* librsync < 1.0.0 */
   sm->sig_job = rs_sig_begin((size_t)blocklen,
                              (size_t)RS_DEFAULT_STRONG_LEN);
+#else /* librsync >= 1.0.0 */
+  sm->sig_job = rs_sig_begin((size_t)blocklen,
+                             (size_t)8, RS_MD4_SIG_MAGIC);
+#endif
   return (PyObject*)sm;
 }