His work is based off 5.3.x, there is probably a branch for it in the official SVN repo. As one commenter noted, the github mirror is stale so he'd need to fork

His work is based off 5.3.x, there is probably a branch for it in the official SVN repo. As one commenter noted, the github mirror is stale so he'd need to fork it and then update it with the official svn to find the branch. It may make sense to rebase it off of trunk of svn.