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-rw-r--r--Source/cmStandardLexer.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/cmStandardLexer.h b/Source/cmStandardLexer.h
index e0b2116..b248b91 100644
--- a/Source/cmStandardLexer.h
+++ b/Source/cmStandardLexer.h
@@ -7,7 +7,7 @@
/* Needed for glibc < 2.12 */
# define _XOPEN_SOURCE 600
#endif
-#if !defined(_WIN32) && !defined(__sun)
+#if !defined(_POSIX_C_SOURCE) && !defined(_WIN32) && !defined(__sun)
/* POSIX APIs are needed */
# define _POSIX_C_SOURCE 200809L
#endif