Include rpl.h in the tarball.
diff --git a/Makefile.in b/Makefile.in
index bc75ba5..8e54a98 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -153,6 +153,7 @@
 	ppp.h \
 	rpc_auth.h \
 	rpc_msg.h \
+	rpl.h \
 	setsignal.h \
 	signature.h \
 	slcompress.h \