c:\ncs\zephyr\samples\application_development\external_lib>west build -p -b nrf5340_dk_nrf5340_cpuapp 
-- west build: making build dir c:\ncs\zephyr\samples\application_development\external_lib\build pristine
-- west build: build configuration:
       source directory: c:\ncs\zephyr\samples\application_development\external_lib
       build directory: c:\ncs\zephyr\samples\application_development\external_lib\build
       BOARD: nrf5340_dk_nrf5340_cpuapp (origin: command line)
-- west build: generating a build system
-- Zephyr version: 2.1.99
-- Found PythonInterp: C:/Python38/python.exe (found suitable version "3.8.2", minimum required is "3.6") 
-- git describe failed: fatal: not a git repository (or any of the parent directories): .git;
   BUILD_VERSION is left undefined
-- Selected BOARD nrf5340_dk_nrf5340_cpuapp
-- Found west: C:/Python38/Scripts/west.exe (found suitable version "0.6.3", minimum required is "0.6.0")
-- Loading C:/ncs/zephyr/boards/arm/nrf5340_dk_nrf5340/nrf5340_dk_nrf5340_cpuapp.dts as base
Devicetree configuration written to C:/ncs/zephyr/samples/application_development/external_lib/build/zephyr/include/generated/devicetree.conf
Parsing C:/ncs/zephyr/Kconfig
C:/ncs/nrf\lib\fprotect/Kconfig:20: WARNING: dt_int_val is deprecated.
C:/ncs/bootloader/mcuboot/zephyr/Kconfig:37: WARNING: dt_int_val is deprecated.
Loaded configuration 'C:/ncs/zephyr/boards/arm/nrf5340_dk_nrf5340/nrf5340_dk_nrf5340_cpuapp_defconfig'
Merged configuration 'C:/ncs/zephyr/samples/application_development/external_lib/prj.conf'
Configuration saved to 'C:/ncs/zephyr/samples/application_development/external_lib/build/zephyr/.config'
-- The C compiler identification is GNU 8.3.1
-- The CXX compiler identification is GNU 8.3.1
-- The ASM compiler identification is GNU
-- Found assembler: C:/gnuarmemb/bin/arm-none-eabi-gcc.exe
-- Cache files will be written to: C:/ncs/zephyr/.cache
-- Configuring done
-- Generating done
-- Build files have been written to: C:/ncs/zephyr/samples/application_development/external_lib/build
-- west build: building application
[1/133] Generating include/generated/kobj-types-enum.h, include/generated/otype-to-str.h
[2/133] Generating include/generated/driver-validation.h
[3/133] Generating misc/generated/syscalls.json
[4/133] Creating directories for 'mylib_project'
[5/133] No download step for 'mylib_project'
[6/133] No patch step for 'mylib_project'
[7/133] No update step for 'mylib_project'
[8/133] No configure step for 'mylib_project'
[9/133] Performing build step for 'mylib_project'
FAILED: mylib/src/mylib_project-stamp/mylib_project-build mylib/lib/libmylib.a 
cmd.exe /C "cd /D C:\ncs\zephyr\samples\application_development\external_lib\mylib && make PREFIX=C:/ncs/zephyr/samples/application_development/external_lib/build/mylib CC=C:/gnuarmemb/bin/arm-none-eabi-gcc.exe AR=C:/gnuarmemb/bin/arm-none-eabi-ar.exe "CFLAGS=-IC:/ncs/zephyr/include -IC:/ncs/zephyr/samples/application_development/external_lib/build/zephyr/include/generated -IC:/ncs/zephyr/soc/arm/nordic_nrf/nrf53 -IC:/ncs/zephyr/lib/libc/minimal/include -IC:/ncs/zephyr/ext/hal/cmsis/Core/Include -IC:/ncs/nrf/include -IC:/ncs/modules/hal/nordic/nrfx -IC:/ncs/modules/hal/nordic/nrfx/drivers/include -IC:/ncs/modules/hal/nordic/nrfx/mdk -IC:/ncs/modules/hal/nordic/. -Ic:/gnuarmemb/bin/../lib/gcc/arm-none-eabi/8.3.1/include -Ic:/gnuarmemb/bin/../lib/gcc/arm-none-eabi/8.3.1/include-fixed -DKERNEL -D__ZEPHYR__=1 -D_FORTIFY_SOURCE=2 -D__PROGRAM_START -DUSE_PARTITION_MANAGER=0 -DNRF5340_XXAA_APPLICATION -Os -imacrosC:/ncs/zephyr/samples/application_development/external_lib/build/zephyr/include/generated/autoconf.h -ffreestanding -fno-common -g -mthumb -mcpu=cortex-m33 -imacrosC:/ncs/zephyr/include/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wno-main -Wno-pointer-sign -Wpointer-arith -Wno-unused-but-set-variable -Werror=implicit-int -fno-asynchronous-unwind-tables -fno-pie -fno-pic -fno-strict-overflow -fno-reorder-functions -fno-defer-pop -fmacro-prefix-map=C:/ncs/zephyr/samples/application_development/external_lib=CMAKE_SOURCE_DIR -fmacro-prefix-map=C:/ncs/zephyr=ZEPHYR_BASE -ffunction-sections -fdata-sections -mabi=aapcs -march=armv8-m.main+dsp -std=c99 -nostdinc -isystemC:/ncs/zephyr/lib/libc/minimal/include -isystemc:/gnuarmemb/bin/../lib/gcc/arm-none-eabi/8.3.1/include -isystemc:/gnuarmemb/bin/../lib/gcc/arm-none-eabi/8.3.1/include-fixed" && "C:\Program Files\CMake\bin\cmake.exe" -E touch C:/ncs/zephyr/samples/application_development/external_lib/build/mylib/src/mylib_project-stamp/mylib_project-build"
'make' is not recognized as an internal or external command,
operable program or batch file.
[10/133] Generating include/generated/syscall_dispatch.c, include/generated/syscall_list.h
ninja: build stopped: subcommand failed.