Build legato 19.02 source for WP76 module

Hi all,
I am trying to build legato 19.02 source for WP76 module:

https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13,-d-,1-components/#sthash.13BE7Elj.fVe5KaBN.dpbs

However after i install the toolchain and extract the legato-19.02.0.tar.bz2, there is no bin/configlegatoenv

Any idea how to build this legato source?

I found the solution is to type “make” first.