http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/ports/gen/Mk/bsd.port.mk.configure-recursive.REL=ALL.diff

See Also
bsd.port.mk.configure-recursive.2.REL=10.1-RELEASE.diff
bsd.port.mk.configure-recursive.2.REL=11.0-CURRENT.diff

This patch allows a human to get all the configure done, that might
require manual input, then a 2nd make can be run later allowing
human to leave the CPU unattended not neading human input.

*** 10.1-RELEASE/ports/Mk/bsd.port.mk	Sat Jan 16 17:56:32 2016
--- new-generic/ports/Mk/bsd.port.mk	Sat Jan 16 18:06:19 2016
***************
*** 5100,5105 ****
--- 5100,5116 ----
  		${ECHO_MSG} "\" to $$target."; \
  	fi;
  
+ .if !target(configure-recursive)
+ configure-recursive:	configure
+ 	@${ECHO_MSG} "===> ${.CURDIR}"
+ 	@${ECHO_MSG} -n "Deps: " ; ${ECHO_MSG} ${ALL-DEPENDS-LIST}
+ 	@for dir in $$(${ALL-DEPENDS-LIST}); do \
+ 		( cd $$dir; echo -n "For ${.CURDIR}: " ;\
+ 		pwd; ${MAKE} configure ) ; \
+ 		done
+ 	@${ECHO_MSG} "<=== ${.CURDIR}"
+ .endif
+ 
  .if !target(reinstall-recursive)
  reinstall-recursive:	reinstall
  	@${ECHO_MSG} "===> ${.CURDIR}"