Portfiles based off of Subversion trunk?

[Jon Hermansen]

Hey everybody, it's been a while!

I'm writing some Portfiles as an experiment for some tools I use at work. We
keep these packages in Subversion and I am currently using 'fetch.type svn'
to pull the sources. Is there a way that I can specify that my packages'
version numbers are based on the checked out revision? Does TCL have
backticks or something similar, and could I use that to pull this data in?

If either is possible, feel free to point me at a currently existing
Portfile that I can work from.

Any help is be greatly appreciated. Thanks.
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