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https://issues.apache.org/jira/browse/HADOOP-7147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403147#comment-13403147
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Allen Wittenauer commented on HADOOP-7147:
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I'm thinking about compiler flags, so CHECK_FUNCTION_EXISTS won't work here. 
(i.e., -xCC, -xc99, -xstrconst, -xparallel, etc).  Also need to pop all the GNU 
specific bits into protected areas so as not to infect everything else.
                
> setnetgrent in native code is not portable
> ------------------------------------------
>
>                 Key: HADOOP-7147
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7147
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Allen Wittenauer
>         Attachments: HADOOP-7147.patch, hadoop-7147.patch
>
>
> HADOOP-6864 uses the setnetgrent function in a way which is not compatible 
> with BSD APIs, where the call returns void rather than int. This prevents the 
> native libs from building on OSX, for example.

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