/usr/lib/ruby/2.5.0/rubygems/ext.rb is in libruby2.5 2.5.1-1ubuntu1.
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#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
##
# Classes for building C extensions live here.
module Gem::Ext; end
require 'rubygems/ext/build_error'
require 'rubygems/ext/builder'
require 'rubygems/ext/configure_builder'
require 'rubygems/ext/ext_conf_builder'
require 'rubygems/ext/rake_builder'
require 'rubygems/ext/cmake_builder'
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