CMake build - did ninja-build become required?

[Jeremy Jacobsohn]

I build 'main' on a Debian system with Cmake and Clang 11. Haven't built for a while. After I sync'd from master I got errors about ninja-build. I didn't have that installed, so installed it and re-ran CMake, which resolved the errors.

Looking through the CMake files it appears that ninja-build is supported but not required. However the github build actions appear to install it if it's not present.

 Is it required now - maybe for one of the supporting libraries? 

[Laurent Perron]

I never need it on Mac or Linux. 

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[Jeremy Jacobsohn]

Thanks for checking - must be an issue with my CMake configuration.

But - now that I have ninja-build installed I will keep it! Super fast on incremental builds. Thank you Google!

[Mizux Seiha]

We try to stick to a vanilla, up to date, CMake install.

Since CMake is a build system GENERATOR, it can generate ninja [multi config] build system but it is not mandatory, also by default on unix system, CMake default will generate a Makefile based build system.