How to fix error: Cygwin gcc cannot be used with --compiler=mingw32

I'm trying to install this project: https://github.com/drufat/triangle. Unfortunatly, I get the following error:

error: Cygwin gcc cannot be used with --compiler=mingw32

I'm using the lastest version of gcc for Cygwin on Windows 7 64 bit and I'm trying to install that project for python 3.7.1. It's seems to come from my distutil configuration. My distutils.cfg file contains:

[build]
compiler=mingw32

I tried that solution but it doens't helped: https://stackoverflow.com/a/16740123/5075502