What is P4ROOT? How to set it?

When I build the tx2 release. There is the message “ERROR: variable not set or empty: P4ROOT”.
I am now debugging this issue. Hope for some info/advices.


I haven’t see this, but were you using command line? If so, what was the exact command? If JetPack, what was checked (or is there a log of the steps just before the error)?