如题
嵌入式linux文件系统没有内置命令declare,应该怎么破。

命令执行现场如下：
# declare
-/bin/sh: declare: not found

busybox关于shell的设置如下：
│ │ Choose your default shell (ash) --->
│ │ --- ash │ │
│ │ [*] bash-compatible extensions │ │
│ │ [*] Job control │ │
│ │ [*] alias support │ │
│ │ [*] Builtin getopt to parse positional parameters │ │
│ │ [*] Builtin version of 'echo' │ │
│ │ [*] Builtin version of 'printf' │ │
│ │ [*] Builtin version of 'test' │ │
│ │ [*] 'command' command to override shell builtins │ │
│ │ [ ] Check for new mail on interactive shells │ │
│ │ [ ] Optimize for size instead of speed │ │
│ │ [ ] Pseudorandom generator and $RANDOM variable │ │
│ │ [ ] Expand prompt string │ │
│ │ [ ] hush │ │
│ │ [ ] lash (deprecated: aliased to hush) │ │
│ │ [ ] msh (deprecated: please use hush) │ │
│ │ [*] POSIX math support │ │
│ │ [ ] Extend POSIX math support to 64 bit │ │
│ │ [*] Hide message on interactive shell startup │ │
│ │ [ ] cttyhack │ │