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Fix features for bsd.
Don't define XOPEN_SOURCE unless we actually need it.
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@ -29,7 +29,8 @@
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#define _POSIX_C_SOURCE 200112L
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#endif
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#ifndef _XOPEN_SOURCE
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/* Needed for realpath on linux */
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#if !defined(_XOPEN_SOURCE) && defined(__linux__)
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#define _XOPEN_SOURCE 500
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#endif
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