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-rw-r--r--include/c.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/c.h b/include/c.h
index 8b2a2d19a..059fadf0b 100644
--- a/include/c.h
+++ b/include/c.h
@@ -80,7 +80,7 @@
# endif
#endif
-#if (__GNUC__ >= 5) || ((__GNUC__ >= 4) && (__GNUC_MINOR__ >= 9))
+#if __GNUC_PREREQ (4, 9)
# define __ul_returns_nonnull __attribute__((returns_nonnull))
#else
# define __ul_returns_nonnull