I'm having this error a couple of times on every build. I've tried disabling all postprocess scripts but this keeps occurring, so I guess that it's something internal.

Failed symlinking runtime library. Falling back to copy.
UnityEngine.Debug:LogWarning(Object)
PostProcessiPhonePlayer:SymlinkFile(String, String)
PostProcessiPhonePlayer:InstalliPhonePluginFiles(String, String, String)
PostProcessiPhonePlayer:UpdateInstallLocation(String, String, String, String, BuildOptions, Boolean, String)
PostProcessiPhonePlayer:PostProcess(BuildTarget, String, String, String, String, String, String, String, BuildOptions, RuntimeClassRegistry)
UnityEditor.HostView:OnGUI()

Anyone has an idea?