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-rw-r--r--doc/info/chap/introduction.texinfo1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/info/chap/introduction.texinfo b/doc/info/chap/introduction.texinfo
index 2f3c2f5..92f6273 100644
--- a/doc/info/chap/introduction.texinfo
+++ b/doc/info/chap/introduction.texinfo
@@ -408,4 +408,5 @@ define @code{_BSD_SOURCE} or @code{_SVID_SOURCE}@.
@c TODO: _THREADSAFE (alias for _REETRANT)
@c TODO: _POSIX_C_SOURCE >= 200112L
@c TODO: _POSIX_C_SOURCE >= 200809L
+@c TODO: _XOPEN_SOURCE >= 600