command not found when build the u-boot

toady i go to my new workstation with ubuntu18.04 installed on virtual box, i tried to build the u-boot per steps on link SoCEDS and ARM Development Studio | Documentation | RocketBoards.org.

when i run command

make -j 24

below error appeared, it seems somthing missed or the path is not right, but i don't know how to solve it, please help me. thanks.

rain@rain-VirtualBox:~/intelFPGA_pro/20.1/embedded/examples/hardware/a10_soc_devkit_ghrd/software/bootloader/u-boot-socfpga$ make -j 24
make: arm-eabi-gcc: Command not found
/bin/sh: 1: arm-eabi-gcc: not found
dirname: missing operand
Try 'dirname --help' for more information.
scripts/kconfig/conf --syncconfig Kconfig
./scripts/binutils-version.sh: line 18: arm-eabi-as: command not found
CHK include/config.h
CFG u-boot.cfg
/bin/sh: 1: arm-eabi-gcc: not found
GEN include/autoconf.mk.dep
/bin/sh: 1: arm-eabi-gcc: not found
scripts/Makefile.autoconf:77: recipe for target 'u-boot.cfg' failed
make[1]: *** [u-boot.cfg] Error 1
make[1]: *** Waiting for unfinished jobs....
CFG spl/u-boot.cfg
scripts/Makefile.autoconf:48: recipe for target 'include/autoconf.mk.dep' failed
make[1]: *** [include/autoconf.mk.dep] Error 1
/bin/sh: 1: arm-eabi-gcc: not found
scripts/Makefile.autoconf:80: recipe for target 'spl/u-boot.cfg' failed
make[1]: *** [spl/u-boot.cfg] Error 1
make: *** No rule to make target 'include/config/auto.conf', needed by 'include/config/uboot.release'. Stop.