Today I upgraded my Gentoo kernel to 2.6.23 version, but I had this problem when emerging madwifi-ng:

 * Messages for package net-wireless/madwifi-ng-0.9.3.3:

 *   CONFIG_CONFIG_KMOD:         is not set when it should be.
 * Please check to make sure these options are set correctly.
 * Failure to do so may cause unexpected problems.
 * Once you have satisfied these options, please try merging
 * this package again.
 *
 * ERROR: net-wireless/madwifi-ng-0.9.3.3 failed.
 * Call stack:
 *                   ebuild.sh, line 1717:  Called dyn_setup
 *                   ebuild.sh, line  768:  Called qa_call ‘pkg_setup’
 *                   ebuild.sh, line   44:  Called pkg_setup
 *   madwifi-ng-0.9.3.3.ebuild, line   34:  Called linux-mod_pkg_setup
 *            linux-mod.eclass, line  465:  Called linux-info_pkg_setup
 *           linux-info.eclass, line  576:  Called check_extra_config
 *           linux-info.eclass, line  475:  Called die
 * The specific snippet of code:
 *              die “Incorrect kernel configuration options”
 *  The die message:
 *   Incorrect kernel configuration options
 *
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at ‘/var/tmp/portage/net-wireless/madwifi-ng-0.9.3.3/temp/build.log’.
 *

Of course KMOD (automatic kernel module loading support) was set. Damn developers!

So I had to:

1. open /usr/src/linux/.config
2. look for CONFIG_KMOD and check tiat it wass indeed set (CONFIG_KMOD=y), otherwise one should have to recompile the kernel.
3. add a line below: CONFIG_CONFIG_KMOD=y (yes, it makes me laugh too)
4. save & close /usr/src/linux/.config
5. emerge madwifi-ng
6. re-open /usr/src/linux/.config
7. delete the previous added line CONFIG_CONFIG_KMOD=y, save and exit.

I guess the bug should be resolved by madwifi developers, but was caused by kernel developers happily removing a CONFIG_ here and there…

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