Issue #13423 has been reported by znz (Kazuhiro NISHIYAMA).

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Bug #13423: error in etc.gemspec
https://bugs.ruby-lang.org/issues/13423

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
* Target version: 2.5
* ruby -v: r58319
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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`git` コマンドがないと `make install` が `etc.gemspec` でエラーになります。

```
Invalid gemspec in [/path/to/ruby/ext/etc/etc.gemspec]: No such file or directory - git
        from ../tool/rbinstall.rb:889:in `<main>'
        from ../tool/rbinstall.rb:889:in `each'
        from ../tool/rbinstall.rb:892:in `block in <main>'
        from ../tool/rbinstall.rb:763:in `block in <main>'
        from ../tool/rbinstall.rb:775:in `install_default_gem'
        from ../tool/rbinstall.rb:775:in `map'
../tool/rbinstall.rb:776:in `block in install_default_gem': invalid spec in/path/to/ruby/ext/etc/etc.gemspec (RuntimeError)
```



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