Examples of use:
* BROKEN_FreeBSD= does not link
* BROKEN_DragonFly= requires later jail
* BROKEN_FreeBSD_8= long type-name is invalid
The latter example could replace something like:
.include <bsd.port.pre.mk>
.if ${OPSYS} == FreeBSD && ${OSVERSION} <= 900000
BROKEN= long type-name is invalid
.endif
Differential Revision: https://reviews.freebsd.org/D2207
Reviewed by: portmgr
Approved by: portmgr (mat)