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From: Alexander Kanavin <alexander.kanavin@linux.intel.com>
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Date: Mon, 29 Aug 2016 15:47:45 +0300
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Subject: Re: [PATCH] ruby: ensure that .ext/rdoc is gone in compile
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On 08/29/2016 03:47 PM, Sujith H wrote:
> From: Christopher Larson <chris_larson@mentor.com>
>
> rdoc gets unhappy if this already exists, so remove it before building.
>
> Without this, it's possible to hit this error:
>
>     Directory .ext/rdoc already exists, but it looks like it isn't an RDoc
>     directory.

> +
> +do_compile_prepend () {
> +    rm -rf .ext/rdoc
> +}
>

The fix may be fixing the symptom and masking a different issue, have 
you checked when and how the error occurs?

Alex