Hi, I just read an email from Miguel (Mono head developer) that in the next mono release (I don't know when this will be) the .NET profile 2.0 and 4.0 will be removed. So the reference assemblies of .NET 2.0 and 4.0 will be no longer in the package. As it seems the new mono release will have the version 4.0, so they are doing a major version bump. If you need them you have to stay with mono 3.10.0 or someone should maintain an AUR package which provides these assemblies. If someone wants to read the discussion on the mono mailinglist you can find it on the mail archive webpage: https://www.mail-archive.com/mono-devel-list@lists.ximian.com/msg30995.html The packages which are provided in our repositories will be working with the new mono release, I will take care of this and move the new mono release to our repository only if all packages are working with it. If this doesn't work, maybe I will provide an old mono3 package and a new mono package for version >= 4. If this is possible, have to check this first. For all the AUR packages you are on your own to check them. Cheers Daniel