Unity 4 Can't build for iOS

I am new to Unity while I try to build project for iOS I get following error.

Error building Player: UnauthorizedAccessException: Access to the path “/Users/Dev/Library/Application Support/Developer/Shared/Xcode/Plug-ins” is denied.

I’ve XCode 4.6 installed and I noticed “/Users/Dev/Library/Application Support/Developer/Shared/Xcode/Plug-ins” directory doesn’t exist in my mac. What am I missing?

Really appreciate any help.

My /Users/Dev/Library/Application Support/Developer/Shared/Xcode/Plug-ins folder has a symlink called Unity4XC.xcplugin that points at:

/Applications/Unity/Unity.app/Contents/BuildTargetTools/iPhonePlayer/Unity4XC.xcplugin

Perhaps use ln command to create this link.

graham$ cd ~/Library/Application\ Support/Developer/Shared/Xcode/
graham$ mkdir Plug-ins
graham$ cd Plug-ins
graham$ ln -s /Applications/Unity/Unity.app/Contents/BuildTargetTools/iPhonePlayer/Unity4XC.xcplugin