Mercurial "externals"

[Bill Barry]

I don't think it is supported yet, but there are workarounds.

I know it is kind of a hack, but you could probably:
1. Create a file in your working directory (externals.bat on windows; I 
am certain unixes can do the same thing)
2. ensure svn is installed and in your path.
3. Add a "Lib" folder to your .hgignore file
4. add a line to your hgrc to run the batch file in the changegroup hook
Have the externals.bat file look something like this:

IF EXISTS Lib GOTO update
mkdir Lib
svn co "http://repo/externals" Lib
:update
svn up Lib