Define _BSD_SOURCE, to get access to POSIX extensions on OpenBSD 4.1+.
diff --git a/Misc/NEWS b/Misc/NEWS
index f42c8ec..06450ba 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -101,6 +101,8 @@
 Build
 -----
 
+- Define _BSD_SOURCE, to get access to POSIX extensions on OpenBSD 4.1+.
+
 - Patch #1673122: Use an explicit path to libtool when building a framework. 
   This avoids picking up GNU libtool from a users PATH.