Just upgraded my build environment from Ubuntu 20 to 24 and it seems that the ruby installation has lost support for the Ruby Just In Time (RJIT) compiler which I had enabled via a environment variable: RUBY_CONFIGURE_OPTS=--enable-yjit. A shame ‘cause this speeds up Jekyll builds considerably! Would love if you brought back support for it 
I’ve asked the devs if this was intentional.
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