Error building hello world sample

[devanshrajgarhia]

I used this command to build the sample hello world
west build -p auto -b qemu_x86 samples/hello_world -DDTC=/usr/bin/dtc

Output:

-- west build: generating a build system
Including boilerplate (Zephyr base): /home/devanshrajgarhia/zephyrproject/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/devanshrajgarhia/zephyrproject/zephyr/samples/hello_world
-- Zephyr version: 2.7.0-rc3 (/home/devanshrajgarhia/zephyrproject/zephyr), build: v2.7.0-rc3-16-gbcf20455ee5e
-- Found Python3: /usr/bin/python3.6 (found suitable exact version "3.6.9") found components: Interpreter 
-- Found west (found suitable version "0.11.1", minimum required is "0.7.1")
-- Board: qemu_x86
-- Cache files will be written to: /home/devanshrajgarhia/.cache/zephyr
-- Using toolchain: zephyr 0.13.1 (/home/devanshrajgarhia/zephyr-sdk-0.13.1)
-- Found dtc: /usr/bin/dtc (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found BOARD.dts: /home/devanshrajgarhia/zephyrproject/zephyr/boards/x86/qemu_x86/qemu_x86.dts
-- Generated zephyr.dts: /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/include/generated/device_extern.h
-- Including generated dts.cmake file: /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/dts.cmake
Parsing /home/devanshrajgarhia/zephyrproject/zephyr/Kconfig
Loaded configuration '/home/devanshrajgarhia/zephyrproject/zephyr/boards/x86/qemu_x86/qemu_x86_defconfig'
Merged configuration '/home/devanshrajgarhia/zephyrproject/zephyr/samples/hello_world/prj.conf'
Configuration saved to '/home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/.config'
Kconfig header saved to '/home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 10.3.0
-- The CXX compiler identification is GNU 10.3.0
-- The ASM compiler identification is GNU
-- Found assembler: /home/devanshrajgarhia/zephyr-sdk-0.13.1/x86_64-zephyr-elf/bin/x86_64-zephyr-elf-gcc
CMake Warning at /home/devanshrajgarhia/zephyrproject/zephyr/subsys/random/CMakeLists.txt:11 (message):
  

      Warning: CONFIG_TEST_RANDOM_GENERATOR is not a truly random generator.
      This capability is not secure and it is provided for testing purposes only.
      Use it carefully.


-- Configuring done
-- Generating done
-- Build files have been written to: /home/devanshrajgarhia/zephyrproject/zephyr/build
-- west build: building application
[1/123] Preparing syscall dependency handling

[112/123] Linking C executable zephyr/zephyr_prebuilt.elf

[123/123] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
             RAM:       53280 B         3 MB      1.69%
        IDT_LIST:          0 GB         2 KB      0.00%

On using : west build -t run I get

-- west build: running target run
[0/1] To exit from QEMU enter: 'CTRL+a, x'[QEMU] CPU: qemu32,+nx,+pae
/home/devanshrajgarhia/zephyr-sdk-0.13.1/sysroots/x86_64-pokysdk-linux/usr/bin/qemu-system-i386: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directory
FAILED: zephyr/CMakeFiles/run /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/CMakeFiles/run 
cd /home/devanshrajgarhia/zephyrproject/zephyr/build && /home/devanshrajgarhia/zephyr-sdk-0.13.1/sysroots/x86_64-pokysdk-linux/usr/bin/qemu-system-i386 -m 4 -cpu qemu32,+nx,+pae -device isa-debug-exit,iobase=0xf4,iosize=0x04 -no-reboot -nographic -no-acpi -net none -pidfile qemu.pid -chardev stdio,id=con,mux=on -serial chardev:con -mon chardev=con,mode=readline -icount shift=5,align=off,sleep=off -rtc clock=vm -kernel /home/devanshrajgarhia/zephyrproject/zephyr/build/zephyr/zephyr.elf
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /home/devanshrajgarhia/.local/bin/cmake --build /home/devanshrajgarhia/zephyrproject/zephyr/build --target run

[yashi]

That means QEMU needs a shared library libX11.so.6, which is in the package libx11-6. I'm not sure what system you are on, but if you have apt, do:

sudo apt-get update && sudo apt-get install libx11-6