Read also /usr/include/features.h confirming Michael's assertion.
** Changed in: manpages (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/791886
Title:
The subject line in this report isn't correct. Read
http://man7.org/linux/man-pages/man7/feature_test_macros.7.html and the
header files carefull!y
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