with 21.1 major release done, xorg has killed its long lived autotools based build sytem in favor of meson in process they have been able to remove ~6000 line of code and configure speed ups with a modern build system. Meson has become delight to use over past couple of year in my personal experience too. I like cmake too but today if I were to write a new piece of software, I would certainly consider using meson before anything for its build system.
https://www.phoronix.com/scan.php?page=news_item&px=X.Org-Bye-Bye-Autotools