Issue #12472 has been reported by Martin Drst.

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Bug #12472: No rule to make target `un-runnable', needed by `runnable'
https://bugs.ruby-lang.org/issues/12472

* Author: Martin Drst
* Status: Open
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* ruby -v: ruby 2.4.0dev (2016-06-05 trunk 55279) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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When I use ```make runnable```, I get the following error message on a fedora system.

```
make: *** No rule to make target `un-runnable', needed by `runnable'.  Stop.
```



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