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modules) together in an attribute set returned by the function "kernelPackagesFor" that takes a kernel as argument. For instance, kernelPackages_2_6_23 is the result of calling this function with kernel_2_6_23. This is necessary in NixOS to make it easier to override the kernel: it's not enough to just specify a different kernel (via the boot.kernel option), but you also need matching nvidiaDriver, aufs, iwlwifi, etc. Having a single attribute set that contains all kernel-related packages makes this much easier. * The kernel now has a passthru attribute "features" that allows NixOS expressions to test whether a kernel has certain features. For instance, the externel "iwlwifi" kernel module package should only be built on kernels < 2.6.24, as kernels >= 2.6.24 have iwlwifi support integrated. So the NixOS expressions can do the test "kernel.features ? iwlwifi" to see if the iwlwifi package should be built. Kernel patches can declare additional features. E.g., the fbsplash patch adds a "fbSplash" feature. svn path=/nixpkgs/trunk/; revision=11881