You don't need to add the JARs one by one - that will be tedious. Just do this:
Create a new Workspace in Eclipse
Select File->Import->Existing Projects Into Workspace->Next
Then for Select Root Directory, browse to your SDK install dir /root/projects.
Press OK in the folder browser and Eclipse will find ALL the Alfresco sub-projects in the projects folder.
That's it, it should all build ok.
Kevin