D10987.id29018.diff
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	Index: head/Makefile.inc1
	===================================================================
	--- head/Makefile.inc1
	+++ head/Makefile.inc1
	@@ -975,6 +975,22 @@
	fi
	.endfor
	.endif
	+#
	+# If installing over the running system (DESTDIR is / or unset) and the install
	+# includes rescue, try running rescue from the objdir as a sanity check. If
	+# rescue is not functional (e.g., because it depends on a system call not
	+# supported by the currently running kernel), abort the installation.
	+#
	+.if !make(distributeworld) && ${MK_RESCUE} != "no" && \
	+ (empty(DESTDIR) \|\| ${DESTDIR} == "/") && empty(BYPASS_INSTALLCHECK_SH)
	+_installcheck_world: __installcheck_sh_check
	+__installcheck_sh_check: .PHONY
	+ @if [ "`${OBJTREE}${.CURDIR}/rescue/rescue/rescue sh -c 'echo OK'`" != \
	+ OK ]; then \
	+ echo "rescue/sh check failed, installation aborted" >&2; \
	+ false; \
	+ fi
	+.endif

	#
	# Required install tools to be saved in a scratch dir for safety.