request of help


I try to compile samples/hello_word
following the instruction on the web.
I'm using an ubuntu 16.04  64bit.
I find a mistake ...
It never find this tools ==> elftools.elf.elffile import ELFFile
I made pip install  pip install pyelftools  but i have the same mistake.
May You help me?
I want to compile forn stm32f4 have you got some suggestion?
May I use the lava tools for the test of my board? in with way ?
Best Regards end Thanks
Novello G.

Se the error...

cd  zephyr/zephyr-git/samples/hello_world
cd make BOARD=arduino_101
And I have this error in a ubuntu 16.04 64 bit
2]: Entering directory
   GEN     ./Makefile
scripts/kconfig/conf --silentoldconfig Kconfig
   DTC     dts/x86/arduino_101.dts_compiled
   CHK     include/generated/generated_dts_board.conf
   UPD     include/generated/generated_dts_board.conf
   CHK     include/generated/generated_dts_board.conf
   Using /home/novello/stm32/zephyr/zephyr as source for kernel
   GEN     ./Makefile
   CHK     include/generated/version.h
   UPD     include/generated/version.h
   CHK     include/generated/generated_dts_board.h
   UPD     include/generated/generated_dts_board.h
   CHK     misc/generated/configs.c
   UPD     misc/generated/configs.c
   CHK     include/generated/offsets.h
Traceback (most recent call last):
   File "/home/novello/stm32/zephyr/zephyr/scripts/",line
8, in
     from elftools.elf.elffile import ELFFile
ImportError: No module named 'elftools'
/home/novello/stm32/zephyr/zephyr/./Kbuild:54: recipe for target
'include/generated/offsets.h' failed
make[3]: *** [include/generated/offsets.h] Error 1
/home/novello/stm32/zephyr/zephyr/Makefile:1085: recipe for target 'prepare'
make[2]: *** [prepare] Error 2
make[2]: Leaving directory
Makefile:178: recipe for target 'sub-make' failed
make[1]: *** [sub-make] Error 2
make[1]: Leaving directory '/home/novello/stm32/zephyr/zephyr'
/home/novello/stm32/zephyr/zephyr/ recipe for target 'all'
make: *** [all] Error 2

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