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The RubyGems we run at build time runs with JRuby 9.4, which causes it to use properties from that version for things like gem paths and extension directories. This is related to the extension disabling change in jruby#8415 and causes the build-time extension faking to use the wrong path. For example: .../gems/shared/extensions/universal-java-25/3.1.0 when it should be .../gems/shared/extensions/universal-java/3.4.0 The change here uses RubyGems' cross-compiling capability by forcing a specific rbconfig.rb to be use, and additionally fakes out the Ruby API version by setting @ruby_api_version on the Gem module. This was discovered while attempting to switch fully to the syslog gem in jruby#9109, since as a bundled gem it will not be activated unless we successfully fake-out the extension build. See also this bug related to the resolv gem installing extensions: * jruby#8649
This reverts commit b5c84d2.
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This was referenced Feb 3, 2026
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This reverts part of #9109 that included it in JRuby as a default gem, rather than a bundled gem, due to the issues described in #9197. I've chery-picked that fix here, and the syslog gem now works properly after the build.
This could be merged into 10.0.3.0 to have the syslog gem move fully "done" but with the default gem change in #9109 it's not a critical change.