Cover C++ installation issue in BuildErrors (#45521)

docs/BuildErrors.md

@@ -60,6 +60,25 @@ Executing `.\restore.cmd` or `.\build.cmd` may produce these errors:
 
 In most cases, this is because the option _Use previews of the .NET Core SDK_ in VS2019 is not checked. Start Visual Studio, go to _Tools > Options_ and check _Use previews of the .NET Core SDK_ under _Environment > Preview Features_.
 
+## Error MSB4019: The imported project Microsoft.Cpp.Default.props was not found.
+
+Executing `.\restore.cmd` or `.\build.cmd` may produce these errors when your development environment is not configured with the correct C++ installation:
+
+```
+C:\git\aspnetcore\src\Servers\IIS\build\Build.Common.Settings(12,3): error MSB4019: The imported project "C:\git\aspnet
+core\.tools\msbuild\17.1.0\tools\MSBuild\Microsoft\VC\v170\Microsoft.Cpp.Default.props" was not found. Confirm that the
+ expression in the Import declaration "C:\git\aspnetcore\.tools\msbuild\17.1.0\tools\MSBuild\Microsoft\VC\v170\\Microso
+ft.Cpp.Default.props" is correct, and that the file exists on disk. [C:\git\aspnetcore\src\Servers\IIS\AspNetCoreModule
+V2\AspNetCore\AspNetCore.vcxproj]
+C:\git\aspnetcore\src\Servers\IIS\build\Build.Common.Settings(12,3): error MSB4019: The imported project "C:\git\aspnet
+core\.tools\msbuild\17.1.0\tools\MSBuild\Microsoft\VC\v170\Microsoft.Cpp.Default.props" was not found. Confirm that the
+ expression in the Import declaration "C:\git\aspnetcore\.tools\msbuild\17.1.0\tools\MSBuild\Microsoft\VC\v170\\Microso
+ft.Cpp.Default.props" is correct, and that the file exists on disk. [C:\git\aspnetcore\src\Servers\IIS\AspNetCoreModule
+V2\IISLib\IISLib.vcxproj]
+```
+
+To resolve this issue, confirm that you've installed the required C++ components in Visual Studio by following the instructions in the [BuildFromSource](./BuildFromSource.md) document.
+
 ## Error: HTTP Error 500.33 - ANCM Request Handler Load Failure
 
 The [ASP.NET Core Module](https://docs.microsoft.com/aspnet/core/host-and-deploy/aspnet-core-module) (ANCM) for IIS is not supported when running projects in this repository.