This can now be built without the source tree present since dtrace.h is now installed for FreeBSD13+. Test Plan: builds on my RPI4 without /usr/src now. Reviewed By: lwhsu Differential Revision: https://reviews.freebsd.org/D29127
This can now be built without the source tree present since dtrace.h is now installed for FreeBSD13+. Test Plan: builds on my RPI4 without /usr/src now. Reviewed By: lwhsu Differential Revision: https://reviews.freebsd.org/D29127