>>> Emerging (2 of 300) net-wireless/madwifi-ng-0.9.3-r3 to /
 * madwifi-0.9.3.tar.bz2 MD5 ;-) ...                                      [ ok ]
 * madwifi-0.9.3.tar.bz2 RMD160 ;-) ...                                   [ ok ]
 * madwifi-0.9.3.tar.bz2 SHA1 ;-) ...                                     [ ok ]
 * madwifi-0.9.3.tar.bz2 SHA256 ;-) ...                                   [ ok ]
 * madwifi-0.9.3.tar.bz2 size ;-) ...                                     [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking madwifi-0.9.3.tar.bz2 ;-) ...                                 [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/2.6.20-sabayon-r3/build
 * Found sources for kernel version:
 *     2.6.20-sabayon-r3
 * Checking for suitable kernel configuration options...
 *   CONFIG_WLAN_80211:  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-r3 failed.
Call stack:
  ebuild.sh, line 1631:   Called dyn_setup
  ebuild.sh, line 703:   Called qa_call 'pkg_setup'
  ebuild.sh, line 44:   Called pkg_setup
  madwifi-ng-0.9.3-r3.ebuild, line 32:   Called linux-mod_pkg_setup
  linux-mod.eclass, line 464:   Called linux-info_pkg_setup
  linux-info.eclass, line 572:   Called check_extra_config
  linux-info.eclass, line 471:   Called die

!!! Incorrect kernel configuration options