syntax: regexp
-^(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)/(bin|lib)(/|$)
-^(acme|sys/src)/(.*/)?[12578vqki]\..*$
-^(acme|sys/src)/.*\.[ao]?[12578vqki]?$
+^(386|68000|68020|alpha|amd64|arm|mips|power|power64|sparc|sparc64)/(bin|lib)(/|$)
+^(acme|sys/src)/(.*/)?[125678vqki]\..*$
+^(acme|sys/src)/.*\.[ao]?[125678vqki]?$
^(dev|fd|net.*|srv|shr|env|root|proc|boot|mnt|n|bin|usr|cfg|cron|mail|tmp)(/|$)
^386/(9(pc|boot).*|pbs|mbr|init)
+^amd64/(9pc64|init)
^acme/bin/(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)(/|$)
^adm/(cache|keys|netkeys|secstore|users|whois|timezone/local)(/|$)
^lib/(ndb|audio|firmware)(/|$)