JakeWharton/ActionBarSherlock — comment on commit 2e1e18cb24299bfa3ed8b26262565a9d1ac9df37
File:  line 0
By JakeWharton:

The compilation of the compat-lib plugin will be handled by maven which I have configured to explode the official compat lib into its class files and filter out the ones I am replacing. Fragment, FragmentManager/FragmentManagerImpl, and FragmentActivity all have to be modified to use the `com.actionbarsherlock.view.Menu*` classes. There is no way to do it without modifying these three files unfortunately. At least with this method the modifications are much less invasive than how v3.x does things.

There will be an extensive write-up closer to the final release which explains how ABS 4.0 is different from 3.x and why things had to be done this way.