Readme: using an installed gem
Fix CFLAGS and LDFLAGS in ruby::version
unfuck rbconfig
Fix quoting
Merge pull request #59 from boxen/unfuck-rbconfig

fix rbconfig
Fix compilation of REE on 10.8
10.9 too
Merge pull request #20 from AlphaHydrae/installed-gem

Cannot run an installed gem
Upgrades ruby-build version and fix two specs
Merge pull request #61 from mnussbaum/upgrade_ruby_build

Upgrades ruby-build version and fixes two specs