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Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →

class method

Gem.default_ext_dir_for

(::String base_dir) -> ::String?
default_ext_dir_for(base_dir)

Returns binary extensions dir for specified RubyGems base dir or nil if such directory cannot be determined.

By default, the binary extensions are located side by side with their Ruby counterparts, therefore nil is returned