capistrano deploy rubyonrails project problems

when use capistrano deploy ror project to linux, resolve problems:
1. svn log has no --limit arguments, update subversion to 1.4.3
2. ** [out :: localhost] sudo: mongrel_rails: command not found
created a symbolic link mongrel_rails to /usr/bin directory
reference:
http://opengrc.org/download/NERUG_presentation_09-11-06.ppt