libphobos/libdruntime/core/sys/netbsd/sys/featuretest.d

/**
  * D header file for NetBSD featuretest;.
  *
  * Copyright: Copyright © 2019, The D Language Foundation
  * License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
  * Authors: Ernesto Castellotti
  */
module core.sys.netbsd.sys.featuretest;

version (NetBSD):

enum _NETBSD_SOURCE = true;