$NetBSD: patch-ad,v 1.1 2005/12/01 19:02:45 joerg Exp $

--- src/lib/io/gr_file_descriptor_source.cc.orig	2005-12-01 18:44:09.000000000 +0000
+++ src/lib/io/gr_file_descriptor_source.cc
@@ -32,6 +32,9 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stdexcept>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 
 gr_file_descriptor_source::gr_file_descriptor_source (size_t itemsize,
