make AUTO_BOOTSTRAP=1 fails and suggests to use AUTO_BOOTSTRAP=1

[Petar]

On Saturday, 1 May 2021 at 01:07:33 UTC, Andrei Alexandrescu 
wrote:
>
> WSL2 running Ubuntu under Windows.
>
> [..]

Something is definitely wrong with your computer. I installed a 
fresh instance of Ubuntu 20.04 on WSL2 and everything worked just 
fine. See for yourself:
https://asciinema.org/a/Poq5VWHHDO7005UjIeQulb3Ye

Here's information about my Windows installation:

```
> systeminfo

Host Name:                 DESKTOP-HPVQAA5
OS Name:                   Microsoft Windows 10 Pro
OS Version:                10.0.19042 N/A Build 19042
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
```

```
> wsl --list -v
   NAME            STATE           VERSION
* Ubuntu-20.04    Running         2
   Ubuntu          Stopped         1
```

After installing the Ubuntu and before starting the asciinema to 
record the, I just had to install `build-essential` and 
`python3-pip`:

```
$ history
     1  sudo apt update && sudo apt install build-essential 
python3-pip
     2  sudo pip3 install asciinema
     3  asciinema rec
     4  history
```

I also tried on another clean Ubuntu and just installing 
`build-essential` (without `python3-pip`) works as well.