OSX 10.5.3: enable Gmail Contact Sync without iPhone

10.5.3 adds ability to sync your address book with gmail contact list.

Unfortunately it only enabled if you’ve ever connected iPhone/iPod touch to your mac.
You can use the following terminal command, to enable the syncing option, if your mac have never seend an iPhone.

defaults write com.apple.iPod Devices -dict-add 000A27001A56740D '{ "Family ID" = 10001; }'

note this is a single line, and not a two line command.