>>> Unpacking source...
>>> Unpacking madwifi-0.9.2.tar.bz2 to /var/tmp/portage/madwifi-ng-tools-0.9.2/work
 * S=/var/tmp/portage/madwifi-ng-tools-0.9.2/work/madwifi-0.9.2
 * PV=0.9.2
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/madwifi-ng-tools-0.9.2/work/madwifi-0.9.2 ...
/bin/sh: line 0: cd: /lib/modules/2.6.17-gentoo-r8/build: No such file or directory
Makefile.inc:89: *** /lib/modules/2.6.17-gentoo-r8/build is missing, please set KERNELPATH.  Stop.

!!! ERROR: net-wireless/madwifi-ng-tools-0.9.2 failed.
Call stack:
  ebuild.sh, line 1546:   Called dyn_compile
  ebuild.sh, line 937:   Called src_compile
  madwifi-ng-tools-0.9.2.ebuild, line 42:   Called die