Makefile:812: *** missing separator. Stop.

[ ! -d "iptables-1.4.21" ] || make -C iptables-1.4.21 || exit $?
make[3]: Entering directory '/home/rtl819x-SDK-v3.4.14b-full-package/new/rtl819x/users/iptables-1.4.21'
Makefile:812: *** missing separator.  Stop.
make[3]: Leaving directory '/home/rtl819x-SDK-v3.4.14b-full-package/new/rtl819x/users/iptables-1.4.21'
Makefile:1564: recipe for target 'iptables-1.4.21' failed
make[2]: *** [iptables-1.4.21] Error 2
make[2]: Leaving directory '/home/rtl819x-SDK-v3.4.14b-full-package/new/rtl819x/users'
Makefile:490: recipe for target 'app' failed
make[1]: *** [app] Error 2
make[1]: Leaving directory '/home/rtl819x-SDK-v3.4.14b-full-package/new/rtl819x/users'
Makefile:160: recipe for target 'bins' failed
make: *** [bins] Error 2

这是由于指令开头不是tab键导致，可以看到linux下显示红色，表示格式问题

 注意：

        Tab要设置为4个字符

 vim ~/.vimrc

增加set tabstop=4

source ~/.vimrc