diff -up ./etc/ypserv.conf.slp-warning ./etc/ypserv.conf
--- ./etc/ypserv.conf.slp-warning	2006-10-12 13:03:32.000000000 +0200
+++ ./etc/ypserv.conf	2013-05-06 18:32:16.581509617 +0200
@@ -13,9 +13,9 @@
 
 # Should we register ypserv with SLP? Only available if SLP support
 # is compiled in. Deprecated functionality.
-slp: no
+# slp: no
 # After how many seconds we should re-register ypserv with SLP?
-slp_timeout: 3600
+# slp_timeout: 3600
 
 # xfr requests are only allowed from ports < 1024
 xfr_check_port: yes