Hi 
I compiled the engine from source and everything worked well but when I decided to package the project it gaves me an error “unknown build failure”.
It’s strange because for the installed version of ue4 (with the launcher) it works …
I searched all the day on google but anything help me to solve this issue.
So if anybody could help me …
Thanks.
ps : it’s this version :
OK I just find how to make it works.
I absolutely don’t know why but when I package the project created automatically by nvidia it works…
But it works so …
I found a wiki page for HairWorks if that is of any use: https://www.everipedia.com/nvidia-hairworks/