arch 64位下直接运行android emulator会出现错误：“Failed to start emulator: Cannot run program "xxxx/sdk/tools/emulator": error=2, No such file or directory
这时要解开/etc/pacman.conf里的multilib的注释
执行pacman -Syu
然后安装
lib32-glibc
lib32-libstdc++5
或者还有：
lib32-libncurses
lib32-zlib