Dec 26 2017, David Runge has written:
You can either set it globally in /etc/makepkg.conf or locally in .makepkg.conf.
Every now and then a pacman upgrade installs a makepkg.conf.pacnew, so it's useful to take a look at it and to adapt the changes to the customised settings.
I'm using "meld" to do this. It's a GUI providing a diff and you could use the GUI as an editor to adapt the changes while displaying the diff.
I don't know if there is something that comfortable, that could be used with Braille, too.