--- rrdcollect-0.2.9/src/checkpid.c	2009-12-06 19:18:19.000000000 +0000
+++ rrdcollect-20120209/src/checkpid.c	2010-02-18 12:35:53.000000000 +0000
@@ -20,6 +20,7 @@
 
 #include "rrdcollect.h"
 #include <fcntl.h>
+#include <sys/file.h>
 
 /* lockfile in rrdcollect.pid */
 /* five digits+"\n\0" */