https://bugs.ruby-lang.org/issues/21340 This is causing google-protobuf, geoip2_compat, and a few other gems to fail building native extensions. It seems that we need to regenerate `./configure` with `autoconf >=2.72` before building ruby to fix this issue per discussion in ruby's bug tracker. @larskanis Probably worth a rebuild of 3.4.4 given lots of extensions are broken (precompiled are fine, compile from source is broken). @MSP-Greg FYI this might affect your ruby-loco builds as well.