[PATCH] fts.3 is not available in LFS builds

[Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>]

As pointed out during a recent discussion on libc-hacker the fts(3)
APIs can't be used with large file offsets:

	https://sourceware.org/bugzilla/show_bug.cgi?id=15838

The manpage should mention this.  Note: the text probably needs some
better formatting at least, but I couldn't come up with proper markup
for compiler arguments.

Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>

diff --git a/man3/fts.3 b/man3/fts.3
index 9374463..2b14c0d 100644
--- a/man3/fts.3
+++ b/man3/fts.3
@@ -774,6 +774,10 @@ The options were invalid.
 These functions are available in Linux since glibc2.
 .SH CONFORMING TO
 4.4BSD.
+.SH BUGS
+All the APIs described in this manpage are not safe when compiling
+a program using the LFS APIs, e.g. by using
+-D_FILE_OFFSET_BITS=64.
 .\" The following statement is years old, and seems no closer to
 .\" being true -- mtk
 .\" The
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