This might be an instance of  https://github.com/haskell/cabal/issues/3462
Try removing spaces and/or newlines around the comma.

пн, 23 мар. 2020 г. в 07:21, David Banas <capn.freako@gmail.com>:
To a package that I import.


On Sun, Mar 22, 2020 at 5:02 PM Henning Thielemann <lemming@henning-thielemann.de> wrote:

On Sun, 22 Mar 2020, David Banas wrote:

> After installing the Haskell Platform on my Windows 10 machine, I attempted to cabal install something and got:
>
>       cabal.exe: The package has a './configure' script. If you are on Windows, This
>       requires a Unix compatibility toolchain such as MinGW+MSYS or Cygwin. If you
>       are not on Windows, ensure that an 'sh' command is discoverable in your path.

Is this message related to your package or to a package that you import?
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