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diff -r rubygems-v1.4.2/lib/rubygems/commands/update_command.rb macruby/lib/rubygems/commands/update_command.rb
50a51,53
>       # XXX MACRUBY We can't allow people to self-update RubyGems at this point.
>       raise "This version of RubyGems cannot be self-updated."
> 
Only in macruby/lib/rubygems: defaults
diff -r rubygems-v1.4.2/lib/rubygems/installer.rb macruby/lib/rubygems/installer.rb
325,327c325,359
<       FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers
< 
<       File.open bin_script_path, 'w', 0755 do |file|
---
>       # XXX MACRUBY do not allow executables to be overriden by a different
>       # Ruby implementation
>       #FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers
> 
>       #File.open bin_script_path, 'w', 0755 do |file|
>       bin_script_exists = File.exists?(bin_script_path)
>       mode   = 'w' unless(bin_script_exists)
>       mode ||= 'r+'
>       new_shebang = shebang(filename)
>       File.open bin_script_path, mode, 0755 do |file|
>         if bin_script_exists
>           # If the first line is different than the shebang we want to insert
>           # we are probably overwriting a script installed by another ruby
>           # implementation / version
>           begin
>             old_shebang = file.readline.chomp
>           rescue
>             old_shebang = ""
>           end
> 
>           if old_shebang != new_shebang
>             warn = <<-WARN_MESSAGE
> You are installing a new version of #{bin_script_path}.
> This file already exists with a different shebang, possibly from a different
> ruby implementation or version. This operation may break the script.
> WARN_MESSAGE
>             alert_warning(warn)
>             if !@force && !ask_yes_no("Do you still wish to continue?")
>               raise Gem::InstallError, "Could not write #{bin_script_path}"
>             end
>             say "Overwrote #{bin_script_path}" if Gem.configuration.really_verbose
>           end
>           file.seek(0)
>           file.truncate(0)
>         end
diff -r rubygems-v1.4.2/lib/rubygems/package/tar_input.rb macruby/lib/rubygems/package/tar_input.rb
206c206,207
<     if defined? Rubinius or defined? Maglev then
---
>     # XXX MACRUBY we also enter the first condition
>     if true#defined? Rubinius or defined? Maglev then
207a209
>       require 'stringio'
diff -r rubygems-v1.4.2/lib/rubygems/package/tar_writer.rb macruby/lib/rubygems/package/tar_writer.rb
42a43,45
>       # XXX MACRUBY mainly because our File.open won't honor 'b'.
>       data = data.force_encoding('BINARY')
> 
diff -r rubygems-v1.4.2/lib/rubygems/platform.rb macruby/lib/rubygems/platform.rb
68a69
>                       when /^macruby$/ then            [ 'macruby',   nil ]
diff -r rubygems-v1.4.2/lib/rubygems/remote_fetcher.rb macruby/lib/rubygems/remote_fetcher.rb
269a270,283
>     # XXX MACRUBY a much faster / more stable downloader code path, using
>     # Foundation instead of Net::HTTP
>     framework 'Foundation'
>     say "Fetching #{uri.to_s}" if Gem.configuration.really_verbose
>     url = NSURL.URLWithString(uri.to_s)
>     data = NSMutableData.dataWithContentsOfURL(url)
>     if data.nil?
>       raise Gem::RemoteFetcher::FetchError.new('error when fetching data', uri)
>     end
>     say "OK" if Gem.configuration.really_verbose
>     data = String.new(data)
>     data.force_encoding(Encoding::BINARY)
>     return data
> 
diff -r rubygems-v1.4.2/lib/rubygems/server.rb macruby/lib/rubygems/server.rb
571c571,572
<       dep = Gem::Dependency.new $2, $3
---
>       marshal_format, name, version, platform = $1, $2, $3, $4
>       dep = Gem::Dependency.new name, version
573d573
<       marshal_format = $1
575c575
<       selector = [$2, $3, $4].map { |s| s.inspect }.join ' '
---
>       selector = [name, version, platform].map { |s| s.inspect }.join ' '
577,578c577,578
<       platform = if $4 then
<                    Gem::Platform.new $4.sub(/^-/, '')
---
>       platform = if platform then
>                    Gem::Platform.new platform.sub(/^-/, '')
diff -r rubygems-v1.4.2/lib/rubygems/specification.rb macruby/lib/rubygems/specification.rb
725c725,727
<     YAML.quick_emit object_id, opts do |out|
---
>     # XXX MACRUBY our quick_emit is different than syck
>     #YAML.quick_emit object_id, opts do |out|
>     YAML.quick_emit nil do |out|