* doc/autoconf.texi: document ac_cv_prog_cc_c11
---
doc/autoconf.texi | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 49f985d..2b4e614 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -7265,7 +7265,9 @@ accepting Standard C is found.
Test for C11 support by checking
for @code{_Alignas}, @code{_Alignof}, @code{_Noreturn},
@code{_Static_assert}, UTF-8 string literals, duplicate @code{typedef}s,
-and anonymous structures and unions.
+and anonymous structures and unions. You can check whether the C compiler
+has been set to accept C11; if not, the shell variable
+@code{ac_cv_prog_cc_c11} is set to @samp{no}.
Test for C99 support by checking
for @code{_Bool}, @code{//} comments, flexible array members,
--
1.7.10.4
