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由 Andy Polyakov 提交于
At earlier point 'which' was replaced with IPC::Cmd::can_run call. Unfortunately on RPM-based systems it is a separate package and it's not given that it's installed. Resurrected 'which' provides poor-man fallback for IPC::Cmd::can_run. Reviewed-by: NRich Salz <rsalz@openssl.org> Reviewed-by: NRichard Levitte <levitte@openssl.org>
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