[Voyage-linux] installation error+kernel

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hello there,
i installed version 0.9.2 in my system and i am trying to install mISDN.
i have tried to compiled the new kernel  simply by following this guide 
and changing the corresponding versions. the 
http://downloads.openvox.cn/pub/misc/IX100/building_voyage_linux_openvox_ix100_from_scratch.pdf
when i try to install mISDN it fails and i get an error:
/checking for sort... /usr/bin/sort
configure: error: kernel build tree does not exist 
build:/lib/modules/3.10.11-voyage/build / 
source:/lib/modules/3.10.11-voyage/source/

i am trying to install mISDN, mISDNuser, chan_lcr, asterisk

i would appreciate any help available.
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