How to build httpstatus on linux using dotnet core 3?

Question

.NET

Source code here https://github.com/Readify/httpstatus

dotnet --version
3.0.100

I go to the src directory in the httpstatus repository. There files:
Teapot.sln Teapot.Web
I collect:

dotnet build
Microsoft (R) Build Engine version 16.3.0+0f4c62fea for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Nothing to do. None of the projects specified contain packages to restore.
/root/httpstatus/src/Teapot.Web/Teapot.Web.csproj(145,3): error MSB4019: The imported project "/usr/share/dotnet/sdk/3.0.100/Microsoft/VisualStudio/v16.0/WebApplications/Microsoft.WebApplication.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk.

Build FAILED.

/root/httpstatus/src/Teapot.Web/Teapot.Web.csproj(145,3): error MSB4019: The imported project "/usr/share/dotnet/sdk/3.0.100/Microsoft/VisualStudio/v16.0/WebApplications/Microsoft.WebApplication.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk.
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.43