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there is no such thing as
.config from kernel.org/pub/linux/kernel/v2.6/linux-2.6.27.tar.bz2
.config is created first time when invoking whicheverconfig script
exactly. the stock kernel source must have a .config file itself.
maybe you should extract sources and check this?
invoking old/default .config and building new custom kernel without modification does not make much sense really.
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