$NetBSD$

--- libs/pbd/fpu.cc.orig	2009-12-31 23:51:11.000000000 +0000
+++ libs/pbd/fpu.cc
@@ -1,4 +1,3 @@
-#define _XOPEN_SOURCE 600
 #include <cstdlib>
 #include <stdint.h>
 #include <cstring>