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-rw-r--r--include/u.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/u.h b/include/u.h
index 297df70a..f84e348a 100644
--- a/include/u.h
+++ b/include/u.h
@@ -35,7 +35,6 @@ extern "C" {
# define __LONG_LONG_SUPPORTED
#endif
#if defined(__AIX__)
-# define _XOPEN_SOURCE 600
# define _ALL_SOURCE
# undef HAS_SYS_TERMIOS
#endif