LinkAssemblies failed to resolve Android.App.Fragment

My app was using a java bound library for google play services as demo'd in the location and services demo. I'm trying to switch it to use the Xamarin component, Google Play Services (Froyo). When I try to build I get the error below with LinkAssemblies. I tried adding a fragment to the LinkerPleaseInclude file, this didn't affect anything. Any ideas? Thanks.

Error  79  The "LinkAssemblies" task failed unexpectedly.
Mono.Cecil.ResolutionException: Failed to resolve Android.App.Fragment
   at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference)
   at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference)
   at Mono.Linker.Steps.MarkStep.InitializeType(TypeDefinition type)
   at Mono.Linker.Steps.MarkStep.InitializeAssembly(AssemblyDefinition assembly)
   at Mono.Linker.Steps.MarkStep.Initialize()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at MonoDroid.Tuner.Linker.Process(LinkerOptions options, LinkContext& context)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__20.MoveNext() C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets   926 5   BLUBCNMOBL.Droid