Chef install isn't optimized yet for OS X 10.9 but there's a hacky way to get it installed.
First, download the install file at https://www.opscode.com/chef/install.sh
Then, edit the install.sh
file and change this part:
"10.6") platform_version="10.6" ;;
"10.7") platform_version="10.7" ;;
"10.8") platform_version="10.7" ;;
Into this:
"10.6") platform_version="10.6" ;;
"10.7") platform_version="10.7" ;;
"10.8") platform_version="10.7" ;;
"10.9") platform_version="10.7" ;;
It's sort of a hacky way of saying that 10.9 should use 10.7's install config. After editing, run the following two commands to complete the install process:
$ chmod a+x install.sh
$ sudo ./install.sh
And there you go, Chef is now installed on OS X 10.9 Mavericks.