$OpenBSD: patch-src_fileio_cpp,v 1.3 2011/09/26 10:12:46 sthen Exp $
--- src/fileio.cpp.orig	Thu Sep 15 16:06:59 2011
+++ src/fileio.cpp	Sat Sep 17 22:50:41 2011
@@ -26,6 +26,7 @@
 #endif
 #include <sys/stat.h>
 #include <algorithm>
+#include <unistd.h>
 
 /*************************************************/
 /* FILE IO ROUTINES ******************************/
