The release notes of the Project Builder 2.1, states that it now supports integration with CVS through SSH. To activate the support, it says that you must set PBXUseExternalAuthenticationAsSSH default to YES. I assume that means to edit the com.apple.projectbuilder.plist in the ~/Library/Preferences directory. I added the line and tried the value type as boolean and string (both set to YES). Even with the new settings, the CVS integration doesn't seem to work. I can execute CVS commands over SSH via Terminal.app just fine. Has anyone gotten this to work?