be a noble strategy in terms of software sharing, it is a condition that is typically unacceptable for commercial use of software. As a consequence, software bound by the GPL terms can not be included in the kernel or "runtime" of OpenBSD, though software subject to GPL terms may be included as development tools or as part of the system that are "optional" as long as such use does not result in OpenBSD as a whole becoming subject to the GPL terms. As an example, GCC and other GNU tools are included in the OpenBSD tool chain. However, it is quite possible to distribute a system for many applications without a tool chain, or the distributor can choose to include a tool chain as an optional bundle which conforms to the GPL terms. NetBSD Much of OpenBSD is originally based on and evolved from NetBSD, since some of the OpenBSD developers were involved in the NetBSD project. The general NetBSD license terms are compatible with the Berkeley license and permit such use. Material subject only to the general NetBSD license can generally be included in OpenBSD. In the past, NetBSD has included material copyrighted by individuals who have imposed license conditions beyond that of the general NetBSD license, but granted the NetBSD Foundation license to distribute the material. Such material can not be included in OpenBSD as long as the conditions imposed are at odds with the OpenBSD license terms or releases from those terms are offered on a discriminatory