changing standard paths for Linux and Mac Os
Purr Data is inheriting from Pd Extended an old and soon to be deprecated standard path for libraries in "~/Library" and "Library" folders. This is still in use in Pd Vanilla today, but I raised a recent discussion in the pd list, which led all other involved on it agree it is a bad target, and how "~/Documents" and "Users/shared" is a more common standard.
I expect this to change in the upcoming release of Vanilla, as a recent change also happened in the Linux world. It used to be ~/pd-externals for "personal installation", but the preferred new location is ~/.local/lib/pd/extra since Pd-Vanilla 0.47-1, as it is also a "more standard" place to go.
I see Pd-l2ork still uses, in Linux, ~/pd-l2ork-externals - how do you feel about adapting to the new Pd standard? You can keep (as in Pd Vanilla) the old path in the search way...
As for Purr Data on the Mac, it's been out only for a month or so now, maybe you don't need to worry so much in keeping the "old way" (that I only learned today about). That is if you agree it is best to change it.
The reasoning behind it is that ~/Library has been a hidden folder in Finder since OS X 10.7 (or so), and it's just not meant to be directly user-accessible. Most users will have a hard time getting there or remembering how to do it. As a teacher, I can't stress that enough...