Issue #12563 has been reported by Yui NARUSE.

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Bug #12563: backport 49758,50356
https://bugs.ruby-lang.org/issues/12563

* Author: Yui NARUSE
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.6p342 (2016-07-07 revision 55599) [x86_64-freebsd10.3]
* Backport: 2.1: UNKNOWN, 2.2: REQUIRED, 2.3: DONTNEED
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49758,50356 is required to run `make test-rubyspec` because without them rubyspec fails to build option/capi/ext.
https://travis-ci.org/ruby/ruby/builds/142788121



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