<도전! 임베디드 OS 만들기> 환경 구축 질문

$ make distclean
$ make gumstix_config
$ make all << 여기서 에러 발생

make[1]: arm-linux-gcc: Command not found
/home/frog/Desktop/workspace/OS/gumstix_uboot/config.mk:186: recipe for target 'cache_8xx.o' failed
make[1]: *** [cache_8xx.o] Error 127
make[1]: 디렉터리 '/home/frog/Desktop/workspace/OS/gumstix_uboot/post' 나감
Makefile:173: recipe for target 'post' failed

⇒  sudo make distclean    
find . -type f \
	\( -name 'core' -o -name '*.bak' -o -name '*~' \
	-o -name '*.o'  -o -name '*.a'  \) -print \
	| xargs rm -f
rm -f examples/hello_world examples/timer \
      examples/eepro100_eeprom examples/sched \
      examples/mem_to_mem_idma2intr examples/82559_eeprom \
      examples/test_burst
rm -f tools/img2srec tools/mkimage tools/envcrc tools/gen_eth_addr
rm -f tools/mpc86x_clk tools/ncb
rm -f tools/easylogo/easylogo tools/bmp_logo
rm -f tools/gdb/astest tools/gdb/gdbcont tools/gdb/gdbsend
rm -f tools/env/fw_printenv tools/env/fw_setenv
rm -f board/cray/L1/bootscript.c board/cray/L1/bootscript.image
rm -f board/trab/trab_fkt board/voiceblue/eeprom
rm -f board/integratorap/u-boot.lds board/integratorcp/u-boot.lds
find . -type f \( -name .depend \
	-o -name '*.srec' -o -name '*.bin' -o -name u-boot.img \) \
	-print0 \
	| xargs -0 rm -f
rm -f  *.bak tags TAGS
rm -fr *.*~
rm -f u-boot u-boot.map u-boot.hex 
rm -f tools/crc32.c tools/environment.c tools/env/crc32.c
rm -f tools/inca-swap-bytes cpu/mpc824x/bedbug_603e.c
rm -f include/asm/proc include/asm/arch include/asm