Where is "mkubi_image" script?

[mahengunawardena]

I am trying to build the Android File System for SAMA5D31-EK. The following link android4sam/bin/view/Android4SAM/ICS4SA ... or_boot_up

references mkubi_image file. Where can I find this file?

Thank

Update
Solution: Execute the following command and mkubi_image is made available

source build/envsetup.sh