# emerge ieee80211
Calculating dependencies ...done!
>>> emerge (1 of 1) net-wireless/ieee80211-1.1.13-r1 to /
>>> md5 files   ;-) ieee80211-1.1.13-r1.ebuild
>>> md5 files   ;-) files/ieee80211-1.1.13-cflags.patch
>>> md5 files   ;-) files/digest-ieee80211-1.1.13-r1
>>> md5 files   ;-) files/remove-old
>>> md5 src_uri ;-) ieee80211-1.1.13.tgz
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found sources for kernel version:
 *     2.6.16-gentoo-r9
 * Checking for suitable kernel configuration options...
 *   ieee80211-1.1.13 requires the in-kernel version of the IEEE802.11 subsystem to be disabled (CONFIG_IEEE80211)
 * 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/ieee80211-1.1.13-r1 failed.
!!! Function check_extra_config, Line 466, Exitcode 0
!!! Incorrect kernel configuration options
!!! If you need support, post the topmost build error, NOT this status message.