I've done git clone and ./build.cmd with no errors. Trying to open FSharp.sln results in errors about missing SDK.
This happens on a machine that previously could open FSharp.Compiler.Service.sln and VisualFSharp.sln fine and seem to have all requirements met.
Visual Studio (FSharp.sln):

Rider (FSharp.Compiler.Service.slnf):
