Not 100% building yet, but these cover some outstanding issues

The new list is based on the constants available as of MRI 2.2.3.

OS X builds started to fail after the release of RubyGems 2.5.0, so this
should fix it.

Apparently building with LLVM enabled includes this flag, probably
because of using `--system-libs`, so building without LLVM fails because
it can't link against zlib.

These will be required by the upcoming release of rubysl-socket.

Consider this example:

    class Parent
      def bar
      end
    end

    class Child < Parent
      def bar
        super
      end

      def foo
      end
    end

    Child.new.foo
    Child.new.bar
    # foo and bar are cached in the global cache

    prepended_module = Module.new do
      def foo
      end
    end
    Child.prepend(prepended_module)
    # foo is cleared from the global cache, but bar is not
    # Child hierarchy is now Child < IncludedModule(prepended_module) < IncludedModule(Child) < Parent

    Child.new.bar
    # When bar is looked up here, being still cached globally, Child#bar is the
    # result of the lookup (normally, it should be IncludedModule(Child)#bar).
    # Now when Child#bar is looking for its super, it goes to the first included
    # module, then the second included module, which has the same method table
    # as Child, returning Child#bar, causing non-ending recursive calls.

If the patch has non-US-ASCII characters, the Regexp matching the date blows up.
Rather than mucking with ridiculous Regexp encodings, we ignore the unneeded patch.

This is required by gethostbyname() which in turn will be used by
rubysl-socket.

This passes 'travis lint' but I don't know what that actually means.

The tar utility appears to be choking on the Linux Travis instance:

  https://s3.amazonaws.com/archive.travis-ci.org/jobs/96797405/log.txt

[ci skip]

RVM appears to correctly map eg rbx-2 to rubinius-2.6.tar.bz2 unless it's running
on Travis. See travis-ci/travis-ci#5294

This change introduces some duplication that will be removed when rewriting
in Bash. Yes, it could be done now; No, it isn't important enough to do it.

RubyGems 2.5.1 installed

=== 2.5.1 / 2015-12-10

Bug fixes:

* Ensure platform sorting only uses strings. Affected binary installs on Windows.
  Issue #1369 reported by Ryan Atball (among others).
  Pull request #1375 by Samuel E. Giddins.
* Revert PR #1332. Unable to reproduce, and nil should be impossible.
* Gem::Specification#to_fullpath now returns .rb extensions when such a file
  exists.  Pull request #1114 by y-yagi.
* RubyGems now handles Net::HTTPFatalError instead of crashing.  Pull
  request #1314 by Samuel E. Giddins.
* Updated bundled Molinillo to 0.4.0.  Pull request #1322, #1396 by Samuel E.
  Giddins.
* Improved performance of spec loading by reducing likelihood of loading he
  complete specification.  Pull request #1373 by Aaron Patterson.
* Improved caching of requirable files  Pull request #1377 by Aaron Patterson.
* Fixed activation of gems with development dependencies.  Pull request #1388
  by Samuel E. Giddins.
* RubyGems now uses the same Molinillo vendoring strategy as Bundler.  Pull
  request #1397 by Samuel E. Giddins.
* Fixed documentation of Gem::Requirement.parse.  Pull request #1398 by
  Juanito Fatas.
* RubyGems no longer warns when a prerelease gem has prerelease dependencies.
  Pull request #1399 by Samuel E. Giddins.
* Fixed Gem::Version documentation example.  Pull request #1401 by Guilherme
  Goettems Schneider.
* Updated documentation links to https://.  Pull request #1404 by Suriyaa
  Kudo.
* Fixed double word typo.  Pull request #1411 by Jake Worth.

=== 2.5.0 / 2015-11-03

Major enhancements:

* Added the Gem::Licenses class which provides a set of standard license
  identifiers as set by spdx.org. This is now used by the
  Gem::Specification#license attribute to try to standardize (though not
  enforce) licenses set by gem authors.

  Pull request #1249 by Kyle Mitchell.

Minor enhancements:

* Use Molinillo as the resolver library.  This is the same resolver as used by
  Bundler.  Pull request #1189 by Samuel E. Giddins.
* Add `--skip=gem_name` to Pristine command.  Pull request #1018 by windwiny.
* The parsed gem dependencies file is now available via Gem.gemdeps following
  Gem.use_gemdeps.  Pull request #1224 by Hsing-Hui Hsu, issue #1213 by
  Michal Papis.
* Moved description attribute to recommended for Gem::Specification.
  Pull request #1046 by Michal Papis
* Moved `Gem::Indexer#abbreviate` and `#sanitize` to `Gem::Specification`.
  Pull request #1145 by Arthur Nogueira Neves
* Cache Gem::Version segments for `#bump` and `#release`.
  Pull request #1131 by Matijs van Zuijlen
* Fix edge case in `levenshtein_distance` for comparing longer strings.
  Pull request #1173 by Richard Schneeman
* Remove duplication from List#to_a, improving from O(n^2) to O(n) time.
  Pull request #1200 by Marc Siegel.
* Gem::Specification.add_specs is deprecated and will be removed from version
  3.0 with no replacement.  To add specs, install the gem, then reset the
  cache.
* Gem::Specification.add_spec is deprecated and will be removed from version
  3.0 with no replacement.  To add specs, install the gem, then reset the
  cache.
* Gem::Specification.remove_spec is deprecated and will be removed from version
  3.0 with no replacement.  To remove specs, uninstall the gem, then reset the
  cache by calling Gem::Specification.reset.
* Call Array#compact before calling Array#uniq for minor speed improvement in
  the Gem::Specification#files method.
  Pull request #1253 by Marat Amerov.
* Use stringio instead of custom String classes.
  Pull request #1250 by Petr Skocik.
* Use URI#host instead of URI#hostname to retain backwards compatibility with
  Ruby 1.9.2 and earlier in util library.
  Pull request #1288 by Joe Rafaniello.
* Documentation update for gem sources.
  Pull request #1324 by Ilya Vassilevsky.
* Documentation update for required_ruby_version.
  Pull request #1321 by Matt Patterson.
* Documentation update for gem update.
  Pull request #1306 by Tim Blair.
* Emit a warning on SRV resolve failure.
  Pull request #1023 by Ivan Kuchin.
* Allow duplicate dependencies between runtime and development.
  Pull request #1032 by Murray Steele.
* The gem env command now shows the user installation directory.
  Pull request #1343 by Luis Sagastume.
* The Gem::Platform#=== method now treats a nil cpu arch the same as 'universal'.
  Pull request #1356 by Daniel Berger.
* Improved memory performance in Gem::Specification.traverse.  Pull request
  #1188 by Aaron Patterson.
* RubyGems packages now support symlinks.  Pull request #1209 by Samuel E.
  Giddins.
* RubyGems no longer outputs mkmf.log if it does not exist.  Pull request
  #1222 by Andrew Hooker.
* Added Bitrig platform.  Pull request #1233 by John C. Vernaleo.
* Improved error message for first-time RubyGems developers.  Pull request
  #1241 by André Arko
* Improved performance of Gem::Specification#load with cached specs.  Pull
  request #1297 by Samuel E. Giddins.
* Gem::RemoteFetcher allows users to set HTTP headers.  Pull request #1363 by
  Agis Anastasopoulos.

Bug fixes:

* Fixed Rake homepage url in example for Gem::Specification#homepage.
  Pull request #1171 by Arthur Nogueira Neves
* Don't crash if partially uninstalled gem can't be found.
  Pull request #1283 by Cezary Baginski.
* Test warning cleanup.
  Pull request #1298 by Samuel E. Giddins.
* Documentation fix for GemDependencyAPI.
  Pull request #1308 by Michael Papis.
* Fetcher now ignores ENOLCK errors in single threaded environments. This
  handles an issue with gem installation on NFS as best we can. Addresses
  issue #1176 by Ryan Moore.
  Pull request #1327 by Daniel Berger.
* Fix some path quoting issues in the test suite.
  Pull request #1328 by Gavin Miller.
* Fix NoMethodError in running ruby processes when gems are uninstalled.
  Pull request #1332 by Peter Drake.
* Fixed a potential NoMethodError for gem cleanup.
  Pull request #1333 by Peter Drake.
* Fixed gem help bug.
  Issue #1352 reported by bogem, pull request #1357 by Luis Sagastume.
* Remove temporary directories after tests finish.  Pull request #1181 by
  Nobuyoshi Nokada.
* Update links in RubyGems documentation.  Pull request #1185 by Darío Hereñú.
* Prerelease gem executables can now be run.  Pull request #1186 by Samuel E.
  Giddins.
* Updated RubyGems travis-ci ruby versions.  Pull request #1187 by Samuel E.
  Giddins.
* Fixed release date of RubyGems 2.4.6.  Pull request #1190 by Frieder
  Bluemle.
* Fixed bugs in gem activation.  Pull request #1202 by Miklós Fazekas.
* Fixed documentation for `gem list`.  Pull request #1228 by Godfrey Chan.
* Fixed #1200 history entry.  Pull request #1234 by Marc Siegel.
* Fixed synchronization issue when resetting the Gem::Specification gem list.
  Pull request #1239 by Samuel E. Giddins.
* Fixed running tests in parallel.  Pull request #1257 by SHIBATA Hiroshi.
* Fixed running tests with `--program-prefix` or `--program-suffix` for ruby.
  Pull request #1258 by Shane Gibbs.
* Fixed Gem::Specification#to_yaml.  Pull request #1262 by Hiroaki Izu.
* Fixed taintedness of Gem::Specification#raw_require_paths.  Pull request
  #1268 by Sam Ruby.
* Fixed sorting of platforms when installing gems.  Pull request #1271 by
  nonsequitur.
* Use `--no-document` over deprecated documentation options when installing
  dependencies on travis.  Pull request #1272 by takiy33.
* Improved support for IPv6 addresses in URIs.  Pull request #1275 by Joe
  Rafaniello.
* Spec validation no longer crashes if a file does not exist.  Pull request
  #1278 by Samuel E. Giddins.
* Gems can now be installed within `rescue`.  Pull request #1282 by Samuel E.
  Giddins.
* Increased Diffie-Hellman key size for tests for modern OpenSSL.  Pull
  request #1290 by Vít Ondruch.
* RubyGems handles invalid config files better.  Pull request #1367 by Agis
  Anastasopoulos.

------------------------------------------------------------------------------

RubyGems installed the following executables:
  /source/rubinius/rubinius/bin/gem

RubyGems system software updated

[ci skip]

[ci skip]