No use to have #define READ_BUF_SIZE 65535 two times.
Diff follows.

// Dunceor

Index: ripd.h
================================================== =================
RCS file: /cvs/src/usr.sbin/ripd/ripd.h,v
retrieving revision 1.3
diff -u -r1.3 ripd.h
--- ripd.h 31 Oct 2006 23:43:11 -0000 1.3
+++ ripd.h 15 Nov 2006 18:43:48 -0000
@@ -31,7 +31,6 @@
#define CONF_FILE "/etc/ripd.conf"
#define RIPD_SOCKET "/var/run/ripd.sock"
#define RIPD_USER "_ripd"
-#define READ_BUF_SIZE 65535

#define NBR_HASHSIZE 128
#define NBR_IDSELF 1