.NET Compilers Toolset Package. Referencing this package will cause the project to be built using the C# and Visual Basic compilers contained in the package, as opposed to the version installed with MSBuild. This package is primarily intended as a method for rapidly shipping hotfixes to customers. Using it as a long term solution for providing newer compilers on older MSBuild installations is explicitly not supported. That can and will break on a regular basis. The supported mechanism for providing new compilers in a build environment is updating to the newer .NET SDK or Visual Studio Build Tools SKU. This package requires either MSBuild 16.3 and .NET Desktop 4.7.2+ or .NET Core 2.1+ More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/adb4347a172149b3ec18552da62e4da6fb2cf362.