[Libguestfs] issue when building/making package from git

[arnaud gaboury]

>
> Apparently this:
>
> https://wiki.manjaro.org/index.php?title=Pacman_troubleshooting#.22Unable_to_lock_database.22_Error
>
I didn't mentioned it, but I already ran

# rm /var/lib/pacman/db.lck
I even tried building with make -j1 just in case some other thread was
locking the DB.

In fact, some process during the build is already locking the DB.