ActionBarSherlock is a library project.
So import the library project in your eclipse
Its a library project. To check Right Click on your library project. goto Properties.
Choose android. You will see a Is Library checked as shown in the below pic.
Add your library project to your Android project.
Right click on your Android project. Goto Properties . Choose android . Click add button add the library to your project. You can see a green tick in the below pic.
Make sure you have one copy of andorid-suuport-v4.jar in your libs folder.
Do not import R.*;
You will see two R.java one for the library project and one for your android project.
Clean and build.