Bug #1699: Define _BSD_SOURCE only on OpenBSD.
diff --git a/Misc/NEWS b/Misc/NEWS
index dffb879..d3ced1f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -183,6 +183,8 @@
 Build
 -----
 
+- Bug #1699: Define _BSD_SOURCE only on OpenBSD.
+
 - Bug #1608: use -fwrapv when GCC supports it.  This is important,
   newer GCC versions may optimize away overflow buffer overflow checks
   without this option!