You may need to update your version of ruby-build
to make sure you have the update where ruby-2.0.0-dev
switched to follow the ruby_2_0_0
branch.
Try running ruby-build --version
and make sure it's one of these (or later):
- v20130907
- v20130901
- v20130806
- v20130628
- v20130518
- v20130514
- v20130501
- v20130408
- v20130227
- v20130226
- v20130225
If not, run brew upgrade ruby-build
.