Istruction to create BTWEB kernel :

export CROSS_COMPILE=/opt/snapgear-toolchain/bin/arm-linux-
export ARCH=arm
cp config_BTWEB .config
sudoenv make CROSS_COMPILE=$CROSS_COMPILE ARCH=$ARCH oldconfig dep zImage modules
sudoenv make INSTALL_MOD_PATH=/where-you-want-modules modules_install

Where:

 For Ubuntu 8.04, if you use sudo to compile, please remember
 that environment will be not save for the compilation, so
 use "sudo env" followed by the command.
 "sudoenv" is better anyway.
 The "sudoenv" script is made by the following 4 lines.

#!/bin/bash
# the env command doesn't spit quotes for variable with blanks. Fix it
E=$(env | grep -v _= | sed -e 's/=/="/' -e 's/$/"/' | tr '\n' ' ')
sudo sh -c "$E $*"

than 

chmod +x sudoenv 
sudo cp sudoenv /usr/local/bin/sudoenv