make build_ios return error 127 - how fix it?

[FetFrumos]

I run the command

make build_ios

But I get error:

  mkdir -p build
  gomobile bind -a -ldflags "-s -w" -tags ios -target=ios -o build/libv2ray.framework github.com/Tai7sy/v2ray_mobile_lib
 /bin/sh: gomobile: command not found 
 make: *** [build_ios] Error 127

How can I fix it? Thank you.