Index: Makefile
===================================================================
--- Makefile
+++ Makefile
@@ -67,13 +67,6 @@
 # r340283 (2018-11) required 167 GB of space.  ZFS lz4 compression
 # achieved a 2.18x ratio, reducing actual space to 81 GB.
 #
-# For individuals wanting to build from the sources currently on their
-# system, the simple instructions are:
-#
-# 1.  `cd /usr/src'  (or to the directory containing your source tree).
-# 2.  Define `HISTORICAL_MAKE_WORLD' variable (see README).
-# 3.  `make world'
-#
 # For individuals wanting to upgrade their sources (even if only a
 # delta of a few days):
 #
@@ -402,53 +395,6 @@
 .error check your date/time: ${STARTTIME}
 .endif
 
-.if defined(HISTORICAL_MAKE_WORLD) || defined(DESTDIR)
-#
-# world
-#
-# Attempt to rebuild and reinstall everything. This target is not to be
-# used for upgrading an existing FreeBSD system, because the kernel is
-# not included. One can argue that this target doesn't build everything
-# then.
-#
-world: upgrade_checks .PHONY
-	@echo "--------------------------------------------------------------"
-	@echo ">>> make world started on ${STARTTIME}"
-	@echo "--------------------------------------------------------------"
-.if target(pre-world)
-	@echo
-	@echo "--------------------------------------------------------------"
-	@echo ">>> Making 'pre-world' target"
-	@echo "--------------------------------------------------------------"
-	${_+_}@cd ${.CURDIR}; ${_MAKE} pre-world
-.endif
-	${_+_}@cd ${.CURDIR}; ${_MAKE} buildworld
-	${_+_}@cd ${.CURDIR}; ${_MAKE} installworld MK_META_MODE=no
-.if target(post-world)
-	@echo
-	@echo "--------------------------------------------------------------"
-	@echo ">>> Making 'post-world' target"
-	@echo "--------------------------------------------------------------"
-	${_+_}@cd ${.CURDIR}; ${_MAKE} post-world
-.endif
-	@echo
-	@echo "--------------------------------------------------------------"
-	@echo ">>> make world completed on `LC_ALL=C date`"
-	@echo "                   (started ${STARTTIME})"
-	@echo "--------------------------------------------------------------"
-.else
-world: .PHONY
-	@echo "WARNING: make world will overwrite your existing FreeBSD"
-	@echo "installation without also building and installing a new"
-	@echo "kernel.  This can be dangerous.  Please read the handbook,"
-	@echo "'Rebuilding world', for how to upgrade your system."
-	@echo "Define DESTDIR to where you want to install FreeBSD,"
-	@echo "including /, to override this warning and proceed as usual."
-	@echo ""
-	@echo "Bailing out now..."
-	@false
-.endif
-
 #
 # kernel
 #