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+I've started to do some Clojure in my spare time. The default tool
+adopted by the community to manage projects is
+[[http://leiningen.org][leiningen]]. For those of you who don't know
+what =lein= is, it's a tool to automate your Clojure project: it will
+boostrap a new project, install the dependencies, and there's a plugin
+mechanism to extend the default possibilities of the tool.
+
+One of the nice feature of the tool is the *checkouts* directory. From
+the
+[[https://github.com/technomancy/leiningen/blob/preview/doc/FAQ.md][FAQ]]:
+
+#+BEGIN_QUOTE
+  If you create a directory named checkouts in your project root and
+  symlink some other project roots into it, Leiningen will allow you to
+  hack on them in parallel.
+#+END_QUOTE
+
+For Python projects at [[http://www.saymedia.com/careers][$work]] I use
+[[http://virtualenvwrapper.readthedocs.org/en/latest/][virtualenvwrapper]]
+to easily work on them without having to deal with conflicting
+dependencies. When I need to change a library that is used by one of the
+project, usually I go to the virtualenv directory and create a symlink
+so it uses the one I'm editing.
+
+What I really want is a mechanism similar to =lein=, where I can have a
+*checkouts/* directory inside the main project, where I can clone a
+library or create a symlink. Since =virtualenvwrapper= provides a hook
+mechanism, I wrote a small hook inside *~/.virtualenvs/postactivate*:
+
+#+BEGIN_SRC sh
+    #!/bin/bash
+
+    # move to the directory of the project
+    proj_name=$(echo $VIRTUAL_ENV|awk -F'/' '{print $NF}')
+    proj_path=/home/vagrant/src/$proj_name
+
+    cd $proj_path
+
+    if [ -d checkouts ]; then
+        for ext in $(ls checkouts); do
+            export PYTHONPATH=proj_path/checkouts/$ext:$PYTHONPATH
+        done
+    fi
+#+END_SRC
+
+Then, when I type =workon $project_name= in my shell, the environment is
+activated, I'm moved to the right directory, and the library inside the
+*checkouts/* directory are added to my *PYTHONPATH*.