Index: head/Makefile.inc1
===================================================================
--- head/Makefile.inc1
+++ head/Makefile.inc1
@@ -2293,13 +2293,12 @@
 
 .for _tool in ${_bootstrap_tools_links}
 ${_bt}-link-${_tool}: .PHONY .MAKE
-	@if [ ! -e "${WORLDTMP}/legacy/bin/${_tool}" ]; then \
-		source_path=`which ${_tool}`; \
-		if [ ! -e "$${source_path}" ] ; then \
-			echo "Cannot find host tool '${_tool}'"; false; \
-		fi; \
-		ln -sfnv "$${source_path}" "${WORLDTMP}/legacy/bin/${_tool}"; \
-	fi
+	@rm -f "${WORLDTMP}/legacy/bin/${_tool}"; \
+	source_path=`which ${_tool}`; \
+	if [ ! -e "$${source_path}" ] ; then \
+		echo "Cannot find host tool '${_tool}'"; false; \
+	fi; \
+	cp -f "$${source_path}" "${WORLDTMP}/legacy/bin/${_tool}"
 ${_bt}-links: ${_bt}-link-${_tool}
 .endfor
 
Index: head/UPDATING
===================================================================
--- head/UPDATING
+++ head/UPDATING
@@ -26,6 +26,12 @@
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20200807:
+	Makefile.inc has been updated to work around the issue documented in
+	20200729. It was a case where the optimization of using symbolic links
+	to point to binaries created a situation where we'd run new binaries
+	with old libraries starting midway through the installworld process.
+
 20200729:
 	r363679 has redefined some undefined behavior in regcomp(3); notably,
 	extraneous escapes of most ordinary characters will no longer be
Index: head/tools/build/Makefile
===================================================================
--- head/tools/build/Makefile
+++ head/tools/build/Makefile
@@ -119,26 +119,25 @@
 host-symlinks:
 	@echo "Linking host tools into ${DESTDIR}/bin"
 .for _tool in ${_host_tools_to_symlink}
-	@if [ ! -e "${DESTDIR}/bin/${_tool}" ]; then \
-		source_path=`which ${_tool}`; \
-		if [ ! -e "$${source_path}" ] ; then \
-			echo "Cannot find host tool '${_tool}'"; false; \
-		fi; \
-		ln -sfnv "$${source_path}" "${DESTDIR}/bin/${_tool}"; \
-	fi
+	@source_path=`which ${_tool}`; \
+	if [ ! -e "$${source_path}" ] ; then \
+		echo "Cannot find host tool '${_tool}'"; false; \
+	fi; \
+	rm -f "${DESTDIR}/bin/${_tool}"; \
+	cp -f "$${source_path}" "${DESTDIR}/bin/${_tool}"
 .endfor
 .for _tool in ${_host_abs_tools_to_symlink}
 	@source_path="${_tool:S/:/ /:[1]}"; \
 	target_path="${DESTDIR}/bin/${_tool:S/:/ /:[2]}"; \
-	if [ ! -e "$${target_path}" ] ; then \
-		if [ ! -e "$${source_path}" ] ; then \
-			echo "Host tool '${src_path}' is missing"; false; \
-		fi; \
-		ln -sfnv "$${source_path}" "$${target_path}"; \
-	fi
+	if [ ! -e "$${source_path}" ] ; then \
+		echo "Host tool '${src_path}' is missing"; false; \
+	fi; \
+	rm -f "$${target_path}"; \
+	cp -f "$${source_path}" "$${target_path}"
 .endfor
 .if exists(/usr/libexec/flua)
-	ln -sf /usr/libexec/flua ${DESTDIR}/usr/libexec/flua
+	rm -f ${DESTDIR}/usr/libexec/flua
+	cp -f /usr/libexec/flua ${DESTDIR}/usr/libexec/flua
 .endif
 
 # Create all the directories that are needed during the legacy, bootstrap-tools