Error with "make SlateViewer" while compiling ue4 to linux

hi, i’m trying to compile ue4 on linux and i get this error in the “make SlateViewer” step:

“ERROR: System.UnauthorizedAccessException: Access to the path “/home/veccher/Documentos/UnrealEngine/Engine/Binaries/Linux/UnrealHeaderTool.target” is denied.”

everything else was fine till this point, i’ve downloaded it from github set 2 2016(so i suppose the version is 4.13), i want to know if there’s something i can do before remake the entire process.

i’ve tried:
using sudo i get this error:
“Refusing to run with the root privileges.
Error: Failed to generate code for SlateViewer - error code: CrashOrAssert (3)”

and i’ve tried sudo chmod -R 777 in the entire UnrealEngine folder

PS.: i’ve installed ue4 on linux before, it was working till last week, when for no apparent reason it wasn’t opening anymore, there was a error message which i can’t remember
and i’m using ubuntu 14.04

Try also chmod’ing/chgrp’ing everything as your user.