Use AC_FUNC_SETVBUF_REVERSED.

diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
index 850dc8f..85b70c7 100644 (file)
--- a/m4/jm-macros.m4
+++ b/m4/jm-macros.m4
@@ -41,4 +41,8 @@ AC_DEFUN(jm_MACROS,
            [Define to the function xargmatch calls on failures.])
   AC_DEFINE(ARGMATCH_DIE_DECL, [extern void usage ()],
            [Define to the declaration of the xargmatch failure function.])
+
+  dnl Used to define SETVBUF in sys2.h.
+  AC_FUNC_SETVBUF_REVERSED
+
 ])