Thanks for the report, adding this in the Alcatraz.
He should do it instead of you ;)
Re:Alcatraz: Xcode Package Manager
by badhairday on Tuesday April 23, 2013 @07:54PM
(#5598729)
I want to use this, but I cannot get it to install. Even after creating this directory.
mkdir -p '/Users/{{username}}/Library/Application Support/Developer/Shared/Xcode/Plug-ins'