Patch by Robert Scheck <robert@fedoraproject.org> for csync2 <= 1.34 based on the
patch by Roman Tereshonkov and Kari Hautio to avoid a build failure with librsync
>= 1.0.0 (which is a security bugfix release). The discussion and solution finding
can be found at https://bugs.launchpad.net/duplicity/+bug/1416344 (for duplicity).

--- csync2-1.34/rsync.c				2007-07-24 23:04:18.000000000 +0200
+++ csync2-1.34/rsync.c.librsync-1.0.0		2015-03-02 00:18:43.000000000 +0100
@@ -134,8 +134,13 @@
 
 	if ( isreg ) {
 		csync_debug(3, "Running rs_sig_file() from librsync....\n");
+#ifdef RS_DEFAULT_STRONG_LEN
 		result = rs_sig_file(basis_file, sig_file,
 				RS_DEFAULT_BLOCK_LEN, RS_DEFAULT_STRONG_LEN, &stats);
+#else /* librsync >= 1.0.0 */
+		result = rs_sig_file(basis_file, sig_file,
+				RS_DEFAULT_BLOCK_LEN, 8, RS_MD4_SIG_MAGIC, &stats);
+#endif
 		if (result != RS_DONE) {
 			csync_debug(0, "Internal error from rsync library!\n");
 			goto error;
@@ -216,8 +221,13 @@
 	if ( !basis_file ) basis_file = fopen("/dev/null", "rb");
 
 	csync_debug(3, "Running rs_sig_file() from librsync..\n");
+#ifdef RS_DEFAULT_STRONG_LEN
 	result = rs_sig_file(basis_file, sig_file,
 			RS_DEFAULT_BLOCK_LEN, RS_DEFAULT_STRONG_LEN, &stats);
+#else /* librsync >= 1.0.0 */
+	result = rs_sig_file(basis_file, sig_file,
+			RS_DEFAULT_BLOCK_LEN, 8, RS_MD4_SIG_MAGIC, &stats);
+#endif
 	if (result != RS_DONE)
 		csync_fatal("Got an error from librsync, too bad!\n");