There is a typo in the initial comments of subversion.eclass. Reproducible: Always Steps to Reproduce:
Created attachment 30287 [details, diff] Simple 1 line patch to fix the typo. Changes ESVN_REPOURI to ESVN_REPO_URI. This patch is against suversion.eclass version 1.9. CVS Header = # $Header: /home/cvsroot/gentoo-x86/eclass/subversion.eclass,v 1.9 2004/04/11 05:46:09 mr_bones_ Exp $.
Fixed in CVS. Thank you for your reporting!