jekyll serve --livereload fails on OpenBSD 7.4-current

$ jekyll32 serve --livereload
Configuration file: /home/holsta/projects/holsta.dk/htdocs/_config.yml
            Source: /home/holsta/projects/holsta.dk/htdocs
       Destination: /home/holsta/projects/holsta.dk/htdocs/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
                    done in 1.883 seconds.
 Auto-regeneration: enabled for '/home/holsta/projects/holsta.dk/htdocs'
Unable to load the EventMachine C extension; To use the pure-ruby reactor, require 'em/pure_ruby'
                    ------------------------------------------------
      Jekyll 4.3.2   Please append `--trace` to the `serve` command
                     for any additional information or backtrace.
                    ------------------------------------------------
<internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require': Cannot load specified object - /home/holsta/.gem/ruby/3.2/gems/eventmachine-1.2.7/lib/rubyeventmachine.so (LoadError)
        from <internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require'
        from /home/holsta/.gem/ruby/3.2/gems/eventmachine-1.2.7/lib/eventmachine.rb:8:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require'
        from <internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require'
        from /home/holsta/.gem/ruby/3.2/gems/em-websocket-0.5.3/lib/em-websocket.rb:3:in `<top (required)>'
        from <internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require'
        from <internal:/usr/local/lib/ruby/3.2/rubygems/core_ext/kernel_require.rb>:86:in `require'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/commands/serve/live_reload_reactor.rb:3:in `<top (required)>'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/commands/serve.rb:143:in `require_relative'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/commands/serve.rb:143:in `register_reload_hooks'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/commands/serve.rb:98:in `process'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/command.rb:91:in `each'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/lib/jekyll/commands/serve.rb:86:in `block (2 levels) in init_with_program'
        from /home/holsta/.gem/ruby/3.2/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
        from /home/holsta/.gem/ruby/3.2/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
        from /home/holsta/.gem/ruby/3.2/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
        from /home/holsta/.gem/ruby/3.2/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
        from /home/holsta/.gem/ruby/3.2/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
        from /home/holsta/.gem/ruby/3.2/gems/jekyll-4.3.2/exe/jekyll:15:in `<top (required)>'
        from /home/holsta/.gem/ruby/3.2/bin/jekyll32:25:in `load'
        from /home/holsta/.gem/ruby/3.2/bin/jekyll32:25:in `<main>'