In the `external' case, the copy of the code is not kept here but in the
`externals/<pkg>' branch in the `elpa' repository.
+
You can check out all the external packages into the `packages' directory
with the command:
make externals
+You can check out a specific external PACKAGE into the `packages'
+directory with these commands:
+
+ cd packages
+ git clone --reference .. --single-branch --branch externals/PACKAGE $(git config remote.origin.url) PACKAGE
+
+If you already have a packages/PACKAGE directory with a previous
+checkout, you can update it like this:
+
+ cd packages/PACKAGE
+ git pull
+
** Public incubation
If you want to develop a package publicly prior to its first release (to