I'm going to add supporting of Mac OS X to the 'sudo' cookbook.
There are two sub-issues which should to be solved:
1) Do not install package 'sudo' if such command is already available (sudo is included to OS X by default)
2) Make specific 'sudoers.erb' template for this platform, because:
- it should include entry about builtin '%admin' group by default
- it should not contains an entry about strange unknown '%sysadmins' group. (Such entry still exists in the default template)