The EncryptionSeed
tag was introduced in the latest Monobjc MonoDevelop Addin to handle resources encryption and is only handled by Monobjc 5.0 serie.
As for the clang
message, this is not quite an error. If you read the description, you will notice that this is a warning. The clang
compiler is called through the Process class which allow the capture of the standard output and error streams. Unfortunately, the warnings are reported on the standard error stream: this is why the embedding task reports some errors when there are only warnings.
Please file a bug if you think the problem is a showstopper.