我已经下载了Gcc编译器和uboot并将它们保存在一个目录中。之后，我使用了以下命令：
export PATH=$PATH:/File address/Gcc_compiler/bin
export CROSS_COMPILE=arm-none-eabi-
export ARCH=arm
make wandboard_config
make
我收到以下错误：
make arm-none-eabi-gcc not found
/bin/sh:arm-none-eabi-gcc not found
dirname:mising operand*
请帮助我不熟悉这个