Cannot satisfy the following dependencies for bash:*libc ？

我在安装 bash 的时候出现问题：

opkg install bash Installing bash (4.3.39-1) to root... Downloading http://downloads.openwrt.org/chaos_calmer/15.05.1/ar71xx/generic/packages/packages/bash_4.3.39-1_ar71xx.ipk. Collected errors:

• satisfy_dependencies_for: Cannot satisfy the following dependencies for bash:
• libc * libc * libc *
• opkg_install_cmd: Cannot install package bash.

如何解决？