Build of glm-0.9.7.6-1-src.tar.xz does not work.

[Jon Turney]

On 22/08/2020 06:00, Marco Atzeri via Cygwin wrote:
> On 21.08.2020 10:35, Carlo B. via Cygwin wrote:
>> Hello,
>> I tried to rebuild glm-0.9.7.6-1-src.tar.xz but the "install" command
>> does not work.
>> I'm getting this error message:
>>
>>>>> Installing glm-0.9.7.6-1.noarch
>> make: ***  Nessuna regola per generare l'obiettivo «install».  Arresto.
>> *** ERROR: make install DESTDIR failed
>>
>> Translated in english, it should be something like this:
>> "No rules to generate target <<install>>. Stop."
>>
[...]
> 
> the error is caused by the build system using now cmake+ninja for
> the execution
> 
> while mingw64-i686-glm and mingw64-x86_64-glm builds stay on the
> previous cmake+make
> 
I am a bit confused by this.  What causes the default generator used by 
cmake to change?  Having old .cygports break due to that seems bad.