VS 2017 build of OF example failed to locate "CL.exe"

After many difficulties wrangling VS 2015/2017 installations with standard and nightly builds of openFrameworks, I thought I had completely cleaned house (Windows 10) of both Visual Studio versions. Of course, Win 10 never completely cleans up.

So, starting from scratch, I’ve reinstalled VS 2017 and pretty confident I checked all the right boxes in the VS Installer. BUT, whether trying to compile and run an OF app from either standard distro (0.9.8) or recent nightly build, I get:

TRACKER : error TRK0005: Failed to locate: "CL.exe". The system cannot find the file specified.

I understand that what’s apparently missing is C-language connection. And I’ve seen old Forum questions about this. But, having scoured Forum and banged hard on VS variations – no success!

Suggestions for what should be an obvious fix to a simple lack of installation files.