https://bugs.winehq.org/show_bug.cgi?id=39402
--- Comment #48 from Andrew Eikum aeikum@codeweavers.com --- (In reply to demurgos from comment #47)
The AUR package does not uses all my CPUs though, so the compilation took a lot of time.
You can set MAKEFLAGS in /etc/makepkg.conf to fix this.