커널 빌드 디렉터리
<code bash>
export KBUILD_OUTPUT="out/dir/"
</code>
====== references ======
  *[[http://www.makelinux.net/make3/make3-CHP-11-SECT-2.html|The Linux Kernel Makefile]]
  *[[http://www.spinics.net/lists/linux-media/|linux-media]] mailing