$OpenBSD: patch-src_Makefile_in,v 1.14 2015/11/23 11:41:02 sthen Exp $
--- src/Makefile.in.orig	Sun Aug  9 16:17:18 2015
+++ src/Makefile.in	Wed Aug 12 16:27:51 2015
@@ -576,7 +576,7 @@ include_HEADERS = rrd.h rrd_format.h rrd_client.h
 rrdcgi_SOURCES = rrd_cgi.c
 rrdcgi_LDADD = librrd.la
 rrdupdate_SOURCES = rrdupdate.c
-rrdupdate_LDADD = librrdupd.la
+rrdupdate_LDADD = librrdupd.la -lpthread
 rrdtool_SOURCES = rrd_tool.c
 rrdtool_DEPENDENCIES = librrd.la
 rrdtool_LDADD = librrd.la
