When updating helptags, the vim-doc eclass creates symlinks for all documents in ${EROOT}/usr/share/vimfiles/doc into ${EROOT}/usr/share/vim73/doc but this is incorrect if ROOT is not equal to "/", for example when cross-compiling into a root intended for running on another device.
Created attachment 320876 [details, diff] Patch to strip $ROOT from the start of created links
The eclass is missing the tags necessary to identify its maintainer. Please add those while you are at it.