Preventing Cygwin from picking up MinGW as host system

[Ilmari Lauhakangas]

On 29.1.2022 16.22, Ilmari Lauhakangas wrote:
> So this beautiful annoyance came up during an email-driven 
> troubleshooting session:
> 
> checking build system type... x86_64-pc-cygwin
> checking host system type... x86_64-pc-mingw32
> 
> and over a dozen mingw-related hits before erroring out on libassuan:
> 
>          Libassuan v has been configured as follows:
> 
>          Revision:   ()
>          Platform: x86_64-pc-mingw32
> 
> Making all in m4
> Making all in src
> mkheader.c
> usage: mkheader host_os template.h version version_number
> make[4]: *** [Makefile:1339: assuan.h] Error 1
> make[3]: *** [Makefile:462: all-recursive] Error 1
> make[2]: *** [Makefile:394: all] Error 2
> make[1]: *** 
> [D:/libre/lode/dev/core/external/libassuan/ExternalProject_libassuan.mk:26: 
> D:/libre/lode/dev/core/workdir/ExternalProject/libassuan/build] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:299: build] Error 2
> 
> Would be tempting to just uninstall MinGW, but the newcomer needs it for 
> other stuff. How can we teach Cygwin to ignore MinGW?

Now I hear this has been solved, but the newcomer is unable to explain 
how exactly.

Ilmari