mruby/mruby — pull request #1987 by take-cheeze (2014-04-02 04:45:43+00:00)
Title: Add mrbgem license checker.

Block passed to `MRuby::Build#set_mrbgem_license_checker(&blk)` will be called per each mrbgems in mrbgems setup with license string argument.
When any of the call returns false the build will fail before it starts.