how to enable one-click install on locally hosted multisite?

Hi – I read Harely Alexander’s excellent WPMU article on how to install a local development area using multisite on a MAC. Everything is working as it should except for one important thing: one-click install of themes or plugins does not work. This includes everything from the WPMU Dev Dashboard. WP says “failed to connect to ftp server…” Since my install is local, ftp should have nothing to do with it. Does anyone know how to work around this or how to tell WP multisite not to bother with FTP and just install the files where they reside locally? Thanks in advance for your feedback…