When i try to run this command to create my device it shows this error and i have ran make -j16 otatools
aditya@ubuntu:~/AOSPM8ET$ ./build/tools/device/mkvendor.sh htc m8et ~/stock/recovery.img
Arguments: htc m8et /home/aditya/stock/recovery.img
unpackbootimg not found. Is your android build environment set up and have the host tools been built?