commit b4cc38f94321c71e8d19fbbd4691e72f7c0d817b
from: Russ Cox <rsc@swtch.com>
date: Tue May 19 02:58:09 2020 UTC

build: drop _XOPEN_SOURCE in u.h on AIX

commit - 6c1235d234dfe290c61c492a1779c7a3ad2f7fc6
commit + b4cc38f94321c71e8d19fbbd4691e72f7c0d817b
blob - 297df70ae54649e3f9de37d03e150ef7d6fa3fe3
blob + f84e348a6762c98e2c94f75f463a9c63b93377d6
--- include/u.h
+++ 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