Calculating dependencies... done!
>>> Emerging (1 of 1) net-wireless/madwifi-ng-0.9.2 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking madwifi-0.9.2.tar.bz2 ;-)
* Determining the location of the kernel source code
* Found kernel source directory:
* /usr/src/linux
* Could not find a usable .config in the kernel source directory.
* Please ensure that /usr/src/linux points to a configured set of Linux sources.
* If you are using KBUILD_OUTPUT, please set the environment var so that
* it points to the necessary object directory so that it might find .config.
!!! ERROR: net-wireless/madwifi-ng-0.9.2 failed.
Call stack:
ebuild.sh, line 1555: Called dyn_setup
ebuild.sh, line 668: Called pkg_setup
madwifi-ng-0.9.2.ebuild, line 32: Called linux-mod_pkg_setup
linux-mod.eclass, line 432: Called linux-info_pkg_setup
linux-info.eclass, line 554: Called die
!!! Unable to calculate Linux Kernel version