Using F# in Visual Studio Code with mono

How can I use F# with Visual Studio Code with mono?

I use CentOS. I installed the Ionide-fsharp plugin but it complains about

Cannot start .NET Core language services because dotnet was not found. Consider: * setting the FSharp.dotnetRoot settings key to a directory with a dotnet binary, * including dotnet in your PATH, * installing .NET Core into one of the default locations, or * using the net FSharp.fsacRuntime to use mono instead

How can I issue this command

net FSharp.fsacRuntime

on my CentOS box? Or, is this a command inside VSC?