I have installed gcc,g++,and sdk , the environment shows that :
ZEPHYR_SDK_INSTALL_DIR=/opt/zephyr-sdkOLDPWD=/shrd/microkernelZEPHYR_BASE=/shrd/zephyrPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/shrd/zephyr/scriptsPWD=/shrd/microkernelSHLVL=2HOME=/rootZEPHYR_GCC_VARIANT=zephyrLESSOPEN=| /usr/bin/lesspipe %sLESSCLOSE=/usr/bin/lesspipe %s %s_=/usr/bin/envLOGNAME=rootARCH=x86

When I build a application (do as https://www.zephyrproject.org/doc/application/application.html ), it failed and shows these :
make[1]: Entering directory `/shrd/zephyr'make[2]: /opt/zephyr-sdk/sysroots/i686-pokysdk-linux/usr/bin/i586-poky-elf/i586-poky-elf-gcc: Command not foundmake[2]: Entering directory `/shrd/microkernel/outdir'make[2]: /opt/zephyr-sdk/sysroots/i686-pokysdk-linux/usr/bin/i586-poky-elf/i586-poky-elf-gcc: Command not found Using /shrd/zephyr as source for kernel /shrd/zephyr is not clean, please run 'make mrproper' in the '/shrd/zephyr' directory.make[2]: *** [prepare3] Error 1make[2]: Leaving directory `/shrd/microkernel/outdir'make[1]: *** [sub-make] Error 2make[1]: Leaving directory `/shrd/zephyr'make: *** [all] Error 2
How to solve this error ?