help me "bash: npm: command not found"

target-mips_r2_uClibc-0.9.33.2/node-bleno-0.1.8

bash: npm: command not found

make[3]: *** [/home/zhang/DOWNLOAD/openwrt-yun/build_dir/target-mips_r2_uClibc-0.9.33.2/node-bleno-0.1.8/.built] Error 127

make[3]: Leaving directory `/home/zhang/DOWNLOAD/openwrt-yun/feeds/packages/arduino/node-bleno'

make[2]: *** [package/feeds/packages/node-bleno/compile] Error 2

make[2]: Leaving directory `/home/zhang/DOWNLOAD/openwrt-yun'

make[1]: *** [/home/zhang/DOWNLOAD/openwrt-yun/staging_dir/target-mips_r2_uClibc-0.9.33.2/stamp/.package_compile] Error 2

make[1]: Leaving directory `/home/zhang/DOWNLOAD/openwrt-yun'

make: *** [world] Error 2

Bash is not available on Yun OS.

READ this:
The Yún CLI Tools
http://codesnippets.altervista.org/documentation/yun/CLI_tools/CLItools.html