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https://issues.apache.org/jira/browse/ARROW-15103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459318#comment-17459318
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Antoine Pitrou commented on ARROW-15103:
----------------------------------------

Ah, we should probably escape the characters at the line given in the error. Do 
you want to submit a PR and do that?

> [Documentation][C++] Error building docs: 
> "arrow/cpp/src/arrow/csv/options.h:182: error: Found unknown command '\r' "
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-15103
>                 URL: https://issues.apache.org/jira/browse/ARROW-15103
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Documentation
>            Reporter: Nicola Crane
>            Priority: Major
>
> I am trying to build the docs, following the instructions at 
> https://arrow.apache.org/docs/developers/documentation.html
> However, after running {{pip install -r docs/requirements.txt}} and then 
> going to {{cpp/apidoc}} and running {{doxygen}} I get the following error:
> {code:java}
> warning: ignoring unsupported tag 'HTML_FORMULA_FORMAT' at line 1537, file 
> Doxyfile
> /home/nic2/arrow/cpp/src/arrow/csv/options.h:182: error: Found unknown 
> command '\r' (warning treated as error, aborting now)
> {code}



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