```ruby
# To be used if the gem has extensions.
# If this task set is inclueded then you will need to also have
#
#   spec.add_development_dependency( 'rake-compiler', '~> 0.8.1' )
#
# in your top level rakefile
begin
  require 'rake/extensiontask'
  require 'rake/javaextensiontask'

  if RUBY_PLATFORM == "java" then

    Rake::JavaExtensionTask.new( This.name) do |ext|
      ext.ext_dir  = File.join( 'ext', This.name, "java" )
      ext.lib_dir  = File.join( 'lib', This.name )
      ext.gem_spec = This.java_gemspec
    end

  else

    Rake::ExtensionTask.new( This.name ) do |ext|
      ext.ext_dir   = File.join( 'ext', This.name, "c" )
      ext.lib_dir   = File.join( 'lib', This.name )
      ext.gem_spec  = This.ruby_gemspec

      ext.cross_compile  = true               # enable cross compilation (requires cross compile toolchain)
      ext.cross_platform = 'i386-mingw32'     # forces the Windows platform instead of the default one
                                              # configure options only for cross compile
    end
  end

  task :test_requirements => :compile
rescue LoadError
  This.task_warning( 'extension' )
end

CLOBBER << FileList["lib/**/*.{jar,so,bundle}"]
CLOBBER << FileList["lib/#{This.name}/{1,2}.*/"]
```

Add x64 architecture to Windows cross-compilation targets
user
```ruby
# To be used if the gem has extensions.
# If this task set is inclueded then you will need to also have
#
#   spec.add_development_dependency( 'rake-compiler', '~> 0.8.1' )
#
# in your top level rakefile
begin
  require 'rake/extensiontask'
  require 'rake/javaextensiontask'

  if RUBY_PLATFORM == "java" then

    Rake::JavaExtensionTask.new( This.name) do |ext|
      ext.ext_dir  = File.join( 'ext', This.name, "java" )
      ext.lib_dir  = File.join( 'lib', This.name )
      ext.gem_spec = This.java_gemspec
    end

  else

    Rake::ExtensionTask.new( This.name ) do |ext|
      ext.ext_dir   = File.join( 'ext', This.name, "c" )
      ext.lib_dir   = File.join( 'lib', This.name )
      ext.gem_spec  = This.ruby_gemspec

      ext.cross_compile  = true                         # enable cross compilation (requires cross compile toolchain)
      ext.cross_platform = %w[x86-mingw32 x64-mingw32]  # forces the Windows platform instead of the default one
                                                        # configure options only for cross compile
    end
  end

  task :test_requirements => :compile
rescue LoadError
  This.task_warning( 'extension' )
end

CLOBBER << FileList["lib/**/*.{jar,so,bundle}"]
CLOBBER << FileList["lib/#{This.name}/{1,2}.*/"]
```
assistant