Implements djb's redo: an alternative to make(1)

Current version

Recent formula history

mikit redo: add test
Miguel Araújo redo: fix audit
Mike McQuaid Use hash rockets again. (#5177)
Mike McQuaid Use Ruby 1.9+ symbol hash keys in all formulae. (#4942)
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages

Formula code at GitHub