md5 command not found

[tienvx]

When I run this command:

scripts/build.sh

This error appear:

Finish building Z008_WW_2.20.40.135 .. 
../scripts/prepare_upload.sh: line 12: md5: command not found
../scripts/prepare_upload.sh: line 13: md5: command not found
../scripts/prepare_upload.sh: line 14: md5: command not found
  adding: system.img (deflated 54%)
../scripts/prepare_upload.sh: line 22: md5: command not found

I'm on ubuntu 15.04 64bit

[shakalaca]

Fix in latest commit