1. 2016-08-04 [ruby-core:76727] [Ruby trunk Bug#12631] Cannot build ruby-core usa 2. 2016-07-28 [ruby-core:76593] [Ruby trunk Bug#12631] Cannot build ruby-core grrussel 3. 2016-07-27 [ruby-core:76586] [Ruby trunk Bug#12631] Cannot build ruby-core grrussel