--- concurrent-ruby-git.old/concurrent-ruby.gemspec
+++ concurrent-ruby-git/concurrent-ruby.gemspec
@@ -15,9 +15,7 @@
   s.date             = Time.now.strftime('%Y-%m-%d')
   s.files            = [*Dir['lib/concurrent-ruby/**/*.rb'] & git_files,
                         *Dir['ext/concurrent-ruby/**/*'] & git_files,
-                        'Rakefile',
-                        'Gemfile',
-                        'lib/concurrent-ruby/concurrent/concurrent_ruby.jar'
+                        'Rakefile', 'Gemfile'
   ]
   s.extra_rdoc_files = Dir['README*', 'LICENSE*', 'CHANGELOG*']
   s.require_paths    = ['lib/concurrent-ruby']
--- concurrent-ruby-git.old/ext/concurrent-ruby-ext/extconf.rb
+++ concurrent-ruby-git/ext/concurrent-ruby-ext/extconf.rb
@@ -9,11 +9,9 @@
 extension_name = 'concurrent_ruby_ext'
 
 dir_config(extension_name)
-have_header "libkern/OSAtomic.h"
+# have_header "libkern/OSAtomic.h"
 
-compiler_is_gcc = (CONFIG["GCC"] && !CONFIG["GCC"].empty?) ||
-    # This could stand to be more generic...  but I am afraid.
-    CONFIG["CC"] =~ /\bgcc\b/
+compiler_is_gcc = 1==1
 
 if compiler_is_gcc
   case CONFIG["arch"]