Xamarin build failures

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We are getting this failure in the Mojave CI vm

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1962,2): error XA2002: Can not resolve reference: `Xamarin.Forms.Platform.Android`, referenced by `controller.Android`. Please add a NuGet package or assembly reference for `Xamarin.Forms.Platform.Android`, or remove the reference to `controller.Android`. [/Users/vagrant/workspace/ice/3.7/csharp/test/xamarin/controller.Android/controller.Android.csproj]

Done Building Project "/Users/vagrant/workspace/ice/3.7/csharp/test/xamarin/controller.Android/controller.Android.csproj" (SignAndroidPackage target(s)) -- FAILED.

Done Building Project "/Users/vagrant/workspace/ice/3.7/csharp/msbuild/ice.proj" (AndroidXamarinBuild target(s)) -- FAILED.



Build FAILED.

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Start with a fresh VM but getting same issue

Seems like brew install dotnet and VisualStudio versions that are not compatible

See:

• https://docs.microsoft.com/en-us/visualstudio/mac/net-core-support?view=vsmac-2019
• Build error GenerateDepFiles with .net core 2.1.602 dotnet/core#2540

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Actually the problem in our case seems to be the update to mono 5.20.1

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https://www.mono-project.com/download/stable/#download-mac

They recommend to stick to 5.18.1 for Visual Studio Mac

[pepone]

Disabled Xamarin testing, this is a problem with the brew packages