Uboot编译出现：Makefile:40: *** missing separator. Stop.

原因：make的版本太低了，我使用的ubuntu虚拟机14版本，make的版本

qx@qx-VirtualBox:~/u-boot$ make -v
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for x86_64-pc-linux-gnu

安装make 4.1版本

wget https://ftp.gnu.org/gnu/make/make-4.1.tar.gz
sudo tar -xzvf make-4.1.tar.gz
cd make-4.1/
./configure --prefix=/usr/local
sudo make
sudo make install
cd /usr/bin
sudo mv make make.bak  # 备份旧版本
sudo ln -s /usr/local/bin/make /usr/bin/make

然后输出

make --version

看到make已经更新到了4.1版本

qx@qx-VirtualBox:/usr/bin$ make --version
GNU Make 4.1
Built for x86_64-unknown-linux-gnu
Copyright (C) 1988-2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

接着进入uboot进行编译，发现没有报错了。

qx@qx-VirtualBox:~/u-boot$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- bananapi_m2_berry_defconfig
#
# configuration written to .config
#