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-rw-r--r--man3/posix_memalign.310
1 files changed, 8 insertions, 2 deletions
diff --git a/man3/posix_memalign.3 b/man3/posix_memalign.3
index 10c407f9..146e44f5 100644
--- a/man3/posix_memalign.3
+++ b/man3/posix_memalign.3
@@ -130,8 +130,14 @@ According to SUSv2,
.BR valloc ()
is declared in \fI<stdlib.h>\fP.
Libc4,5 and glibc declare it in \fI<malloc.h>\fP and perhaps also in <stdlib.h>
-(namely, if _GNU_SOURCE is defined, or _BSD_SOURCE is defined, or,
-for glibc, if _XOPEN_SOURCE_EXTENDED is defined, or, equivalently,
+(namely, if
+.B _GNU_SOURCE
+is defined, or
+.B _BSD_SOURCE
+is defined, or,
+for glibc, if
+.B _XOPEN_SOURCE_EXTENDED
+is defined, or, equivalently,
_XOPEN_SOURCE is defined to a value not less than 500).
.SH NOTES
On many systems there are alignment restrictions, for example, on buffers