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How do I check what options are compiled into a linux kernel if I don't have access to the /boot/config-* file that's left over?

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Unless your kernel was built with CONFIG_IKCONFIG_PROC, which would make the config available in /proc as sysadmin1138 mentioned above, you're pretty much out of luck. Debian and RH based kernel packages do, however, generally install a config-$version file in /boot. So unless it's a custom kernel, it should be available there.

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I believe /proc/config.gz contains the .config file the kernel was compiled with.

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That's only available if CONFIG_IKCONFIG_PROC was set when the kernel was built. Doesn't seem to be there by default on RHEL or Ubuntu. – Insyte Aug 6 '09 at 17:19
As of writing, this is enabled by default on Arch :) – Navin Apr 25 at 0:33

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