Import C under Windows 10

[DLearner]

This relates to:

```
DMD64 D Compiler v2.112.0
Copyright (C) 1999-2025 by The D Language Foundation, All Rights 
Reserved written by Walter Bright

```

While trying to compile and run hello.c (ie trying out Import C):

```
#include <stdio.h>
int main()
{
    printf("Hello world.\n");
    return 0;
}

```

I got

```
Error: cl.exe not found. Please ensure that Visual Studio Build 
Tools are installed and properly configured.
```
despite repeatedly downloading everything I could find relating 
to Visual Studio 2019.

FWIW, isn't 'cl.exe' MS's _own_ C compiler - I wanted to use the 
C compiler within DMD.

Ideas?