[PD] standard paths for externals

[Max]

I'm looking for the canonical paths to install externals for the 
different platforms and only can find information which seems to be 
outdated, like here:

http://puredata.info/docs/faq/how-do-i-install-externals-and-help-files

At least deken seems to install into ~/Documents/Pd/externals instead.

There has been discussions about this frequently, but I can't seem to 
find the results of it. Was there something which was agreed upon?

For which paths should an installer (ore make install) of an external 
look for?

Thanks

m.