solving file conflicts

Hi fellow-archers, I have two packages, A and B, which both provide the same file X. Is there a way to tell pacman to ignore file X in package B, so it is installed (and updated) solely with A? My current ideas are: * repackage B (the official package), so it does not include X anymore -> tedious, feels unnecessary * change packaging of A (unofficial package), so X is now called Y -> this will break a lot of configs, because X is hooked up in many places -> I'd like to avoid this option * tell pacman to ignore X in package B (something like NoExtract - but except, that it is package specific and that it works as I need it ;-p) regards, Erich