Using svn for portfile management

[js]

Hi,

As an occasional Portfile editor, I prefer to use svn to manage Portfiles
than rsync because that allow me to check diffs or changelogs easily.

One problem is PortIndex.
Everytime I port update to get the latest port tree,
I have to rebuild, which takes a long time to finish.

Is there any easier way of doing this job?
I'm using a bit old Mac, doing portindex everytime is not a easy job.

Thanks.