Problem With mkvendor.sh for extrating device files from boot.img

Hey Guys:D:D:D:D:D:D

I'm new in Android Developing so to learn complete Rom build or as stuff I only had.I started Building cm11 from source but my device have'nt had a build yet so I'm trying to to get device files but when apply

Code:

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./build/tools/device/mkvendor.sh celkon w138_wkt_241 ~/boot.img

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I'm getting this error

Code:

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Arguments: celkon w138_wkt_21 /home/gopinadh/boot.img
unpackbootimg not found. Is your android build environment set up and have the host tools been built?

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Then I had apply

Code:

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make -j4 otatools

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but no result
I'm using Ubuntu 16.04 LTS version I'm struck here in the guide http://ift.tt/28SFHRo
You can view ScreenShot down there:good:
Can anyone Help me.........

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