Hi, I'm not on my computer, so I can't be sure, but I think that emacs packages conflict with each other. One uninstalls the other one when getting install. There's probably an Arch oriented solution to that, which I don't know about, but I suggest you to try the Guix package manager, which allows you to install even different versions of the same package in parallel, plus many other features.
You can install and use it alongside the pacman, they usually don't interfere. By the way, why you want to keep the PGTK build installed? I tried it a few months ago, and besides the WebKitGTK functionality, it didn't provide anything more, while missing many advantages of the Lucid build. -- Best Regards, Abraham Sent with Tutanota; https://tuta.com
