I have the latest Xamarin Studio beta installed from here: http://releases.xamarin.com/ (cycle 6 RC 3)
I'm running the latest El Capitan (10.11.1) and XCode (7.1.1).
When I create a new F# Cocoa Mac app and attempt to build, I get the following errors:
FSC: Error FS0219: The referenced or default base CLI library 'mscorlib' is binary-incompatible with the referenced F# core library '/Library/Frameworks/Mono.framework/Versions/4.2.1/lib/mono/gac/FSharp.Core/126.96.36.199__b03f5f7f11d50a3a/FSharp.Core.dll'. Consider recompiling the library or making an explicit reference to a version of this library that matches the CLI version you are using. (FS0219)
FSC: Error FS0218: Unable to read assembly '/Library/Frameworks/Mono.framework/Versions/4.2.1/lib/mono/gac/FSharp.Core/188.8.131.52__b03f5f7f11d50a3a/FSharp.Core.dll' (FS0218)
Has anyone else run into this? Is there a known workaround? Any help would be appreciated.