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-rw-r--r--math/math.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/math/math.h b/math/math.h
index 0aedaf1d56..ae83262338 100644
--- a/math/math.h
+++ b/math/math.h
@@ -262,7 +262,7 @@ extern int matherr __P ((struct exception *__exc));
#endif /* SVID */
-#ifdef __USE_BSD
+#if defined __USE_BSD || defined __USE_UNIX98
/* Some useful constants. */
# define M_E _Mldbl(2.7182818284590452354) /* e */
@@ -292,7 +292,7 @@ extern int matherr __P ((struct exception *__exc));
Please note we define the macro even if the constants are not defined.
This helps us to use the macros in other places. */
-#if __STDC__ - 0 || __GNUC__ - 0
+#if (__STDC__ - 0 || __GNUC__ - 0) && defined __USE_GNU
# define _Mldbl(x) x##L
#else /* Traditional C. */
# define _Mldbl(x) x