* Found sources for kernel version:
 *     2.6.20-sabayon-r1
 * Checking for suitable kernel configuration options...
 *   ipw3945-1.2.0 requires support for Generic IEEE 802.11 Networking Stack (CONFIG_IEEE80211).
 *   CONFIG_IEEE80211_CRYPT_CCMP:        is not set when it should be.
 *   CONFIG_IEEE80211_CRYPT_TKIP:        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/ipw3945-1.2.0 failed.
Call stack:
  ebuild.sh, line 1580:   Called dyn_setup
  ebuild.sh, line 665:   Called pkg_setup
  ipw3945-1.2.0.ebuild, line 39:   Called linux-mod_pkg_setup
  linux-mod.eclass, line 458:   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
!!! If you need support, post the topmost build error, and the call stack if relevant.