install-doc:
ifneq ($(wildcard $O/doc/html),)
$(Q)$(call rte_mkdir, $(DESTDIR)$(docdir))
- $(Q)tar -cf - -C $O/doc html --exclude 'html/guides/.*' | \
+ $(Q)tar -cf - -C $O/doc --exclude 'html/guides/.*' html | \
tar -xf - -C $(DESTDIR)$(docdir) --strip-components=1 \
--keep-newer-files
endif