This page (see URL) should probably mention ESVN_OPTIONS, as that's a good place to put e.g., "-r 1234" for a frozen SVN ebuild. It might even be worth adding that as an example. Apologies if this isn't part of the Developers Howto.
Created attachment 135132 [details, diff] Add in ESVN_OPTIONS Added in a short description, and I used your example since its the most common usage of the variable. Someone please commit? :)
21:55:47 <+CIA-3> halcy0n * r107 devmanual/trunk/eclass-reference/subversion.eclass/text.xml: Mention ESVN_OPTIONS; fixes bug #156657