Issue #12736 has been reported by Kazuhiro NISHIYAMA.

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Bug #12736: `make install` says `fatal: Not a git repository (or any of theparent directories): .git`
https://bugs.ruby-lang.org/issues/12736

* Author: Kazuhiro NISHIYAMA
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.4.0dev (2016-09-07 trunk 56091) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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`make install` の時に `fatal: Not a git repository (orany of the parent directories): .git` というメッセージが2回出ます。

ext/psych/psych.gemspec と lib/rdoc/rdoc.gemspec の

```
s.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
```

が原因のようです。



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