librsync error: “RS_DEFAULT_STRONG_LEN” undeclared

We needed to compile an old version of rdiff-backup on CentOS 7 but got the following error:

 _librsyncmodule.c: In function â_librsync_new_sigmakerâ:
_librsyncmodule.c:63:17: error: âRS_DEFAULT_STRONG_LENâ undeclared (first use in this function)
 (size_t)RS_DEFAULT_STRONG_LEN);
 ^
_librsyncmodule.c:63:17: note: each undeclared identifier is reported only once for each function it appears in
_librsyncmodule.c:63:9: error: too few arguments to function ârs_sig_beginâ
 (size_t)RS_DEFAULT_STRONG_LEN);
 ^
In file included from _librsyncmodule.c:25:0:
/usr/include/librsync.h:370:11: note: declared here
 rs_job_t *rs_sig_begin(size_t new_block_len,
 ^
error: command 'gcc' failed with exit status 1

The librsync library changed the colling convention of `rs_sig_begin` so if you get an error like that, then a patch like this might help:

]# diff -uw _librsyncmodule.c.ORIG _librsyncmodule.c
--- _librsyncmodule.c.ORIG 2006-11-11 23:32:01.000000000 -0800
+++ _librsyncmodule.c 2018-02-20 11:22:06.529111816 -0800
@@ -59,8 +59,8 @@
 if (sm == NULL) return NULL;
 sm->x_attr = NULL;

- sm->sig_job = rs_sig_begin((size_t)blocklen,
- (size_t)RS_DEFAULT_STRONG_LEN);
+ sm->sig_job = rs_sig_begin((size_t)blocklen, 8,
+ (size_t)RS_MD4_SIG_MAGIC);
 return (PyObject*)sm;
 }

-Eric