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Define variable SSTATE_PRUNE_OBSOLETEWORKDIR with '?=' in sstate.bbclass, then it could be overwritten by user configuration. (From OE-Core rev: 22af59c9bfec31b31027ebd2a4da162f481aa6b5) Signed-off-by: Kai Kang <kai.kang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>